我知道有很多相同的问题,但是我没有找到Android Oreo的解决方案(8.0,API 26)。
我的问题是什么:
当我在按钮上点击更多时间以启动 activityforresult 时,活动开始了更多时间!
奇怪的东西:
-
classic'startActivity(意图)'不要这样做"问题" =活动仅启动一次
-
它仅发生在带有Android Oreo的设备/模拟器上(较旧版本正常工作)
示例代码:
清单:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="sandbox.jarda.cz.activityresulttest">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".SecondActivity"
android:launchMode="singleTop" />
</application>
</manifest>
Java代码示例:
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
((Button) findViewById(R.id.startButton)).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getApplicationContext(), SecondActivity.class);
// starts Activity more times on double tap
startActivityForResult(intent, 0);
//works fine BUT I WANT RESULT
startActivity(intent);
}
});
}
}
尝试禁用视图,然后启动活动
@Override
public void onClick(View view) {
view.setEnabled(false);
Intent intent = new Intent(getApplicationContext(), SecondActivity.class);
// starts Activity more times on double tap
startActivityForResult(intent, 0);
//enable button
view.setEnabled(true);
//OR enable button after half second etc
new Handler().postDelayed(new Runnable() {
view.setEnabled(true);
}, 500);
}
您也可以继续禁用,直到从其他活动中恢复过来为止。启用Main Activitive on Activitive
中的按钮@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
//enable button here
}
单击下面的单击后,您可以禁用该按钮。
Button.setEnabled(false);
您可以将代码重写如下
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
((Button) findViewById(R.id.startButton)).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
((Button) findViewById(R.id.startButton)).setEnabled(false);
Intent intent = new Intent(getApplicationContext(), SecondActivity.class);
// starts Activity more times on double tap
startActivityForResult(intent, 0);
//works fine BUT I WANT RESULT
startActivity(intent);
}
});
}
}
您可以通过使用此按钮禁用该按钮。
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
((Button) findViewById(R.id.startButton)).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
view.setEnabled(false);
view.postDelayed(() -> view.setEnabled(true),200);
Intent intent = new Intent(getApplicationContext(), SecondActivity.class);
// starts Activity more times on double tap
startActivityForResult(intent, 0);
//works fine BUT I WANT RESULT
startActivity(intent);
}
});
}
}