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安卓:从按钮点击开始新活动



我是安卓开发的新手，所以请帮助我：

我有一个带有 7 个按钮的 xml 文件，命名为：btn_1btn_2，...btn_7

这是activity_main.xml

<Button 
   android:layout_width="103dp" 
   android:layout_height="82dp" 
   android:id="@+id/btn_1" 
   android:layout_below="@+id/heading1" 
   android:layout_alignParentLeft="true" 
   android:layout_alignParentStart="true" 
   android:background="@mipmap/pic1" 
   style="@style/Base.Widget.AppCompat.Button.Borderless"
   android:clickable="true" />

这是主要活动.java -

public class MainActivity extends AppCompatActivity {
  private static Button btn1, btn2, btn3, btn4, btn5, btn6, btn7;
  @
  Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    OnClickButtonListener();
  }
  public void OnClickButtonListener() {
    btn1 = (Button) findViewById(R.id.btn_1);
    btn1.setOnClickListener(new View.OnClickListener() {@
      Override
      public void onClick(View v) {
        Intent intent_1 = new Intent(MainActivity.this, MainActivity_1.class);
        startActivity(intent_1);
      }
    });

    btn2 = (Button) findViewById(R.id.btn_2);
    btn2.setOnClickListener(new View.OnClickListener() {@
      Override
      public void onClick(View v) {
        Intent intent_2 = new Intent(MainActivity.this, MainActivity_2.class);
        startActivity(intent_2);
      }
    });
    btn3 = (Button) findViewById(R.id.btn_3);
    btn3.setOnClickListener(new View.OnClickListener() {@
      Override
      public void onClick(View v) {
        Intent intent_3 = new Intent(MainActivity.this, MainActivity_3.class);
        startActivity(intent_3);
      }
    });
    btn4 = (Button) findViewById(R.id.btn_4);
    btn4.setOnClickListener(new View.OnClickListener() {@
      Override
      public void onClick(View v) {
        Intent intent_4 = new Intent(MainActivity.this, MainActivity_4.class);
        startActivity(intent_4);
      }
    });
    btn5 = (Button) findViewById(R.id.btn_5);
    btn5.setOnClickListener(new View.OnClickListener() {@
      Override
      public void onClick(View v) {
        Intent intent_5 = new Intent(MainActivity.this, MainActivity_5.class);
        startActivity(intent_5);
      }
    });
    btn6 = (Button) findViewById(R.id.btn_6);
    btn6.setOnClickListener(new View.OnClickListener() {@
      Override
      public void onClick(View v) {
        Intent intent_6 = new Intent(MainActivity.this, MainActivity_6.class);
        startActivity(intent_6);
      }
    });
    btn7 = (Button) findViewById(R.id.btn_7);
    btn7.setOnClickListener(new View.OnClickListener() {@
      Override
      public void onClick(View v) {
        Intent intent_7 = new Intent(MainActivity.this, MainActivity_7.class);
        startActivity(intent_7);
      }
    });
  }
}

当我单击按钮时，应用程序崩溃，但令人惊讶的是并非总是如此。此外，在一次尝试中，它在单击btn_6时崩溃，然后在下一次尝试中（当我重新打开应用程序时），它会在按下其他按钮时崩溃，比如现在按钮 5！

现在，如果我关闭应用程序，然后重试，它可能会在按btn_3时崩溃，而在之前的尝试中它会正常工作。

有什么见解吗？谢谢。

这是最新的日志猫：

05-25 23:43:17.139 17042-17042 <XX> W/ <YY>: VFY: unable to resolve virtual method 134: Landroid/app/Activity;.onEnterAnimationComplete ()V
05-25 23:43:17.139 17042-17042 <XX> D/ <YY>: VFY: replacing opcode 0x6f at 0x140b
05-25 23:43:17.179 17042-17042 <XX> D/ <YY>: GC_FOR_ALLOC freed 345K, 3% free 54952K/56516K, paused 15ms, total 16ms
05-25 23:43:17.179 17042-17042 <XX> I/ <YY>-heap: Forcing collection of SoftReferences for 11040016-byte allocation
05-25 23:43:17.199 17042-17042 <XX> D/ <YY>: GC_BEFORE_OOM freed 3K, 3% free 54948K/56516K, paused 22ms, total 22ms
05-25 23:43:17.199 17042-17042 <XX> E/ <YY>-heap: Out of memory on a 11040016-byte allocation.
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>: "main" prio=5 tid=1 RUNNABLE
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>:   | group="main" sCount=0 dsCount=0 obj=0x41e4f578 self=0x41e3a4e8
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>:   | sysTid=17042 nice=-16 sched=0/0 cgrp=apps handle=1074368508
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>:   | state=R schedstat=( 3391699451 331158977 2372 ) utm=269 stm=70 core=0
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>:     at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>:     at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:596)
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>:     at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:444)
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>:     at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:832)
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>:     at android.content.res.Resources.loadDrawable(Resources.java:2988)
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>:     at android.content.res.TypedArray.getDrawable(TypedArray.java:602)
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>:     at android.view.View.<init>(View.java:3563)
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>:     at android.widget.TextView.<init>(TextView.java:881)
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>:     at android.widget.Button.<init>(Button.java:108)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.support.v7.widget.AppCompatButton.<init>(AppCompatButton.java:62)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.support.v7.widget.AppCompatButton.<init>(AppCompatButton.java:58)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.support.v7.app.AppCompatViewInflater.createView(AppCompatViewInflater.java:105)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.support.v7.app.AppCompatDelegateImplV7.createView(AppCompatDelegateImplV7.java:972)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.support.v7.app.AppCompatDelegateImplV7.onCreateView(AppCompatDelegateImplV7.java:1030)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.support.v4.view.LayoutInflaterCompatHC$FactoryWrapperHC.onCreateView(LayoutInflaterCompatHC.java:44)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:690)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.view.LayoutInflater.rInflate(LayoutInflater.java:761)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.view.LayoutInflater.inflate(LayoutInflater.java:498)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.view.LayoutInflater.inflate(LayoutInflater.java:398)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.view.LayoutInflater.inflate(LayoutInflater.java:354)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:276)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:136)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at abcpqr.red.MainActivity_1.onCreate(MainActivity_1.java:21)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.app.Activity.performCreate(Activity.java:5372)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2257)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.app.ActivityThread.access$700(ActivityThread.java:159)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.os.Handler.dispatchMessage(Handler.java:99)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.os.Looper.loop(Looper.java:176)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at android.app.ActivityThread.main(ActivityThread.java:5419)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at java.lang.reflect.Method.invokeNative(Native Method)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at java.lang.reflect.Method.invoke(Method.java:525)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
05-25 23:43:17.209 17042-17042 <XX> I/ <YY>:     at dalvik.system.NativeStart.main(Native Method)
05-25 23:43:17.209 17042-17042 <XX> D/skia: --- decoder->decode returned false
05-25 23:43:17.209 17042-17042 <XX> D/AndroidRuntime: Shutting down VM
05-25 23:43:17.209 17042-17042 <XX> W/ <YY>: threadid=1: thread exiting with uncaught exception (group=0x41e4e700)
05-25 23:43:17.209 17042-17042 <XX> E/AndroidRuntime: FATAL EXCEPTION: main
                                                                                           java.lang.OutOfMemoryError
                                                                                               at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
                                                                                               at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:596)
                                                                                               at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:444)
                                                                                               at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:832)
                                                                                               at android.content.res.Resources.loadDrawable(Resources.java:2988)
                                                                                               at android.content.res.TypedArray.getDrawable(TypedArray.java:602)
                                                                                               at android.view.View.<init>(View.java:3563)
                                                                                               at android.widget.TextView.<init>(TextView.java:881)
                                                                                               at android.widget.Button.<init>(Button.java:108)
                                                                                               at android.support.v7.widget.AppCompatButton.<init>(AppCompatButton.java:62)
                                                                                               at android.support.v7.widget.AppCompatButton.<init>(AppCompatButton.java:58)
                                                                                               at android.support.v7.app.AppCompatViewInflater.createView(AppCompatViewInflater.java:105)
                                                                                               at android.support.v7.app.AppCompatDelegateImplV7.createView(AppCompatDelegateImplV7.java:972)
                                                                                               at android.support.v7.app.AppCompatDelegateImplV7.onCreateView(AppCompatDelegateImplV7.java:1030)
                                                                                               at android.support.v4.view.LayoutInflaterCompatHC$FactoryWrapperHC.onCreateView(LayoutInflaterCompatHC.java:44)
                                                                                               at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:690)
                                                                                               at android.view.LayoutInflater.rInflate(LayoutInflater.java:761)
                                                                                               at android.view.LayoutInflater.inflate(LayoutInflater.java:498)
                                                                                               at android.view.LayoutInflater.inflate(LayoutInflater.java:398)
                                                                                               at android.view.LayoutInflater.inflate(LayoutInflater.java:354)
                                                                                               at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:276)
                                                                                               at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:136)
                                                                                               at abcpqr.red.MainActivity_1.onCreate(MainActivity_1.java:21)
                                                                                               at android.app.Activity.performCreate(Activity.java:5372)
                                                                                               at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
                                                                                               at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2257)
                                                                                               at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)
                                                                                               at android.app.ActivityThread.access$700(ActivityThread.java:159)
                                                                                               t android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
                                                                                               at android.os.Handler.dispatchMessage(Handler.java:99)
                                                                                               at android.os.Looper.loop(Looper.java:176)
                                                                                               at android.app.ActivityThread.main(ActivityThread.java:5419)
                                                                                               at java.lang.reflect.Method.invokeNative(Native Method)
                                                                                               at java.lang.reflect.Method.invoke(Method.java:525)
                                                                                               at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
                                                                                               at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
                                                                                               at dalvik.system.NativeStart.main(Native Method)
05-25 23:43:25.074 17042-17042 <XX> I/Process: Sending signal. PID: 17042 SIG: 9

这是我的XML的要点：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:ads="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="xxx.MainActivity">
   <Button
       android:layout_width="103dp"
       android:layout_height="82dp"
       android:id="@+id/btn_inside"
       android:layout_below="@+id/LL_subheading1"
       android:layout_centerHorizontal="true"
       android:background="@mipmap/pic_small_inside"
       style="@style/Widget.AppCompat.Button.Borderless"
       android:clickable="true"/>
   <Button
       android:layout_width="103dp"
       android:layout_height="82dp"
       android:id="@+id/btn_on_the_side1"
       android:layout_below="@+id/LL_subheading2"
       android:layout_alignParentLeft="true"
       android:layout_alignParentStart="true"
       android:background="@mipmap/pic_small_on_the_side1"
       style="@style/Base.Widget.AppCompat.Button.Borderless"
       android:clickable="true"/>
   <Button
       android:layout_width="103dp"
       android:layout_height="82dp"
       android:id="@+id/btn_on_the_side3"
       android:layout_below="@+id/LL_subheading2"
       android:layout_alignParentRight="true"
       android:layout_alignParentEnd="true"
       android:background="@mipmap/pic_small_on_the_side3"
       style="@style/Base.Widget.AppCompat.Button.Borderless"
       android:clickable="true"/>
   <Button
       android:layout_width="103dp"
       android:layout_height="82dp"
       android:id="@+id/btn_on_the_side2"
       android:layout_alignTop="@+id/btn_on_the_side1"
       android:layout_centerHorizontal="true"
       android:background="@mipmap/pic_small_on_the_side2"
       style="@style/Base.Widget.AppCompat.Button.Borderless"
       android:clickable="true"/>
   
   <Button
       android:layout_width="103dp"
       android:layout_height="82dp"
       android:id="@+id/btn_outside1"
       android:layout_below="@+id/LL_subheading3"
       android:layout_alignParentLeft="true"
       android:layout_alignParentStart="true"
       android:background="@mipmap/pic_small_outside1"
       style="@style/Base.Widget.AppCompat.Button.Borderless"
       android:clickable="true"/>
   <Button
       android:layout_width="103dp"
       android:layout_height="82dp"
       android:id="@+id/btn_outside2"
       android:layout_below="@+id/LL_subheading3"
       android:layout_centerHorizontal="true"
       android:background="@mipmap/pic_small_outside2"
       style="@style/Base.Widget.AppCompat.Button.Borderless"
       android:clickable="true"/>
   <Button
       android:layout_width="103dp"
       android:layout_height="82dp"
       android:id="@+id/btn_outside3"
       android:layout_below="@+id/LL_subheading3"
       android:layout_alignParentRight="true"
       android:layout_alignParentEnd="true"
       android:background="@mipmap/pic_small_outside3"
       style="@style/Base.Widget.AppCompat.Button.Borderless"
       android:clickable="true"/>
</RelativeLayout>

首先，让我给你一些建议。按以下方式重新排列代码，以避免在创建屏幕（OnCreate 方法）上浪费处理时间：

设计 （xml） 按钮应具有单击时的属性，例如：

<Button android:id="@+id/button" 
    android:onClick="onClickButton" 
    android:text="Awesome" />

然后为每个按钮创建一个方法：

public void onClickButton(View v){
   // Code to run after button click
}

此方法需要返回 void 并将视图作为参数。

为了帮助您解决错误，我需要出现在安卓显示器上的日志猫。您只需要将手机连接到PC并从开发环境中运行应用程序即可。

您使用大图像，但设备内存不足。请检查您的图像大小。并分享您的 Xml 布局

class="one_answers">请使用

以下代码并检查

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private Button btn1, btn2, btn3, btn4, btn5, btn6, btn7;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn1 = (Button) findViewById(R.id.btn_1);
        btn2 = (Button) findViewById(R.id.btn_2);
        btn3 = (Button) findViewById(R.id.btn_3);
        btn4 = (Button) findViewById(R.id.btn_4);
        btn5 = (Button) findViewById(R.id.btn_5);
        btn6 = (Button) findViewById(R.id.btn_6);
        btn7 = (Button) findViewById(R.id.btn_7);
        btn1.setOnClickListener(this);
        btn2.setOnClickListener(this);
        btn3.setOnClickListener(this);
        btn4.setOnClickListener(this);
        btn5.setOnClickListener(this);
        btn6.setOnClickListener(this);
        btn7.setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
        switch(v.getId()) {
            case R.id.btn_1:
                Intent intent_1 = new Intent(MainActivity.this, MainActivity_1.class);
                startActivity(intent_1);
                break;
            case R.id.btn_2:
                Intent intent_2 = new Intent(MainActivity.this, MainActivity_2.class);
                startActivity(intent_2);
                break;
            ...
            case R.id.btn_7:
                Intent intent_7 = new Intent(MainActivity.this, MainActivity_7.class);
                startActivity(intent_7);
                break;
        }
    }
}

你得到一个OutOfMemoryException .查看您的

logcatjava.lang.OutOfMemoryError android.graphics.BitmapFactory. nativeDecodeAsset(Native Method)

问题是您正在

按钮上创建新活动 单击活动很重，而且您正在从资产文件夹中加载这些活动中的位图。包含大量位图的新活动实例导致错误。

解决方案：将活动替换为片段，并使用Glide或Picasso加载图像。

注意：从现在开始，如果应用程序崩溃尝试在logcat中搜索"致命"，则该日志将有错误解释。

您遇到的错误可能是由于

1.使用大尺寸图像

2.您应该始终完成以前的活动，以便在从一个活动移动到另一个活动后释放一些内存。

3.每当您开始在应用程序中使用更多数量的图像时，您应该在应用程序的Android清单文件中设置android:largeHeap="true"

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