如何在 android 中以编程方式为线性布局中的文本视图设置边距

Question

我正在尝试为添加到线性布局中的每个文本框添加边距，该布局位于滚动视图中。无论我设置的边距有多大，它都不会反映在 UI 上。为什么？我已经提到了很多关于这个堆栈溢出本身的东西。

import android.content.res.Resources;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutCompat;
import android.util.TypedValue;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import android.widget.TextView;
import org.w3c.dom.Text;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
    ScrollView mainScrollView;
    LinearLayout scrollViewContainer;
    ArrayList<String> stringArr;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mainScrollView = (ScrollView) findViewById(R.id.mainScrollView);
        scrollViewContainer = (LinearLayout)findViewById(R.id.scrollViewContainer);
        stringArr = new ArrayList<String>();
        String str1 = "In computer programming, a string is traditionally a sequence of characters, either as a literal constant or as some kind of variable. " +
                "The latter may allow its elements to be mutated and the length changed, or it may be fixed (after creation).";
        String str2 = "Initializes a newly created String object so that it represents the same sequence of characters as the argument; " +
                "in other words, the newly created string is a copy of the argument string. Unless an explicit copy of original is needed," +
                " use of this constructor is unnecessary since Strings are immutable.";
        for(int ii = 0; ii < 10; ii++){
            if(ii%2 ==  0) {
                stringArr.add(str1);
            }else{
                stringArr.add(str2);
            }
        }
        Resources r = getResources();
        float pxLeftMargin = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20, r.getDisplayMetrics());
        float pxTopMargin = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20, r.getDisplayMetrics());
        float pxRightMargin = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10, r.getDisplayMetrics());
        float pxBottomMargin = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20, r.getDisplayMetrics());
        LinearLayoutCompat.LayoutParams textViewLayoutParams =  new LinearLayoutCompat.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        for(int ii = 0; ii < stringArr.size(); ii++){
            TextView textView = new TextView(this);
            textView.setTextSize(12f);
            textView.setText(stringArr.get(ii));
            textView.setLayoutParams(textViewLayoutParams);
            textViewLayoutParams.setMargins(10,30,10,30);
            textView.requestLayout();
            scrollViewContainer.addView(textView);
        }
    }
}

Answer 1

您的问题在于使用

LinearLayoutCompat.LayoutParams textViewLayoutParams =  new LinearLayoutCompat.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);

而是使用：

LinearLayout.LayoutParams textViewLayoutParams =  new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);

Answer 2

textViewLayoutParams.setMargins(10,30,10,30);
textView.setLayoutParams(textViewLayoutParams);

这可能是问题所在...您正在编辑文本视图布局参数后将其设置为textView.setLayoutParams(textViewLayoutParams) ...

Answer 3

您正在使用 LinearLayout，因此请尝试使用 LinearLayout.LayoutParams

Answer 4

`<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 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"
 android:background="#fff"
 tools:context="com.example.sheheryar.quicktransport.Signin">

<ScrollView
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:fillViewport="false">
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"            >
        <ImageView
            android:layout_width="250dp"
            android:layout_height="155dp"
            android:id="@+id/imageView2"
            android:background="@drawable/logo1"
            android:layout_marginTop="10dp"
            android:layout_gravity="center_horizontal" />
        <android.support.design.widget.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="40px">
            <EditText
                android:layout_width="fill_parent"
                android:layout_height="40dp"
                android:textSize="15dp"
                android:inputType="textEmailAddress"
                android:ems="10"
                android:id="@+id/editTextemail"
                android:hint="Enter email"/>
        </android.support.design.widget.TextInputLayout>
        <android.support.design.widget.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp">
            <EditText
                android:layout_width="fill_parent"
                android:layout_height="40dp"
                android:textSize="15dp"
                android:inputType="textPassword"
                android:ems="10"
                android:id="@+id/editTextpassword"
                android:hint="Password"/>
        </android.support.design.widget.TextInputLayout>
        <CheckBox
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Remember Password"
            android:textColor="#6b6b6b"
            android:id="@+id/cbRemberPassword"
            android:layout_centerVertical="true"
            android:layout_centerHorizontal="true"
            android:checked="false" />
        <Button
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="Sign in"
            android:id="@+id/buttonsigin"
            android:textColor="#ffffff"
            android:onClick="userlogin"
            android:background="@drawable/button_styles1"
            android:layout_marginTop="20dp"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="OR"
            android:id="@+id/textView1"
            android:textColor="#f99906"
            android:textStyle="bold"
            android:textSize="18dp"
            android:layout_marginTop="10dp"
            android:layout_gravity="center_horizontal" />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Create New Account"
            android:id="@+id/textView"
            android:textColor="#6b6b6b"
            android:textSize="18dp"
            android:layout_marginTop="5dp"
            android:layout_gravity="center_horizontal" />

    </LinearLayout>
  </ScrollView>
</RelativeLayout>`

签入 XML 文件。在"资源">"布局"下。设置边距。也许这会有所帮助。