Question

我制作了一个Android应用程序，可在单击按钮时播放声音。这些声音也可以通过信使共享。所有这些按钮（它们的外观和位置）都在activity_main.xml中指定。问题是，当我在我的应用程序中向上或向下滚动时，它看起来很糟糕，因为它不顺畅，我的应用程序似乎有点滞后。

这是我的代码，其中包含一些按钮和图像视图，例如

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    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"">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/r1">

    <Button
        android:text="@string/sound1"
        android:layout_marginTop="33dp"
        android:id="@+id/sound1"
        android:layout_width="210dp"
        android:background="@drawable/backgroundbuttons"
        android:layout_height="50dp"
        android:layout_alignRight="@+id/sound3"
        android:layout_alignEnd="@+id/sound3"
        android:textSize="13sp" />

    <Button
        android:text="@string/sound2"
        android:layout_width="210dp"
        android:layout_height="50dp"
        android:layout_marginTop="8dp"
        android:id="@+id/sound2"
        android:background="@drawable/backgroundbuttons"
        android:layout_below="@+id/sound1"
        android:layout_alignLeft="@+id/sound1"
        android:layout_alignStart="@+id/sound1"
        android:textSize="13sp" />

    <ImageView
        android:layout_width="50dp"
        android:layout_height="50dp"
        app:srcCompat="@drawable/sharebutton"
        android:id="@+id/share_button1"
        android:layout_alignBottom="@+id/sound1"
        android:layout_toRightOf="@+id/sound1"
        android:layout_toEndOf="@+id/sound1" />

    <ImageView
        android:layout_width="50dp"
        android:layout_height="50dp"
        app:srcCompat="@drawable/sharebutton"
        android:id="@+id/share_button2"
        android:layout_alignBottom="@+id/sound2"
        android:layout_toRightOf="@+id/sound2"
        android:layout_toEndOf="@+id/sound2" />

我的activity_main中总共有 25个按钮和25个图像视图，如下所示。所有这些图像视图都基于一个文件（ sharebutton.jpg ）。

修改主要活动类：

public class MainActivity extends AppCompatActivity {

private MediaPlayer mp;

private MessengerThreadParams mThreadParams;
private boolean mPicking;

private static final int REQUEST_CODE_SHARE_TO_MESSENGER = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Button s1 = (Button) findViewById(R.id.sound1);
    Button s2 = (Button) findViewById(R.id.sound2);
    findViewById(R.id.share_button1).setOnClickListener(new View.OnClickListener(){

        @Override
        public void onClick(View v){
            onMessengerButtonClicked1();
        }

    });

    findViewById(R.id.share_button2).setOnClickListener(new View.OnClickListener(){

        @Override
        public void onClick(View v){
            onMessengerButtonClicked2();
        }

    });

    Intent intent = getIntent();
    if (Intent.ACTION_PICK.equals(intent.getAction())) {
        mThreadParams = MessengerUtils.getMessengerThreadParamsForIntent(intent);
        mPicking = true;
    }

    s1.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            onPause();
            mp = MediaPlayer.create(MainActivity.this, R.raw.a1);
            mp.start();
        }

    });


    s2.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            onPause();
            mp = MediaPlayer.create(MainActivity.this, R.raw.a2);
            mp.start();
        }

private void onMessengerButtonClicked1() {
    // The URI can reference a file://, content://, or android.resource.
    Uri uri =
            Uri.parse("android.resource://" + getPackageName()+ "/raw/" +R.raw.a1);

    ShareToMessengerParams shareToMessengerParams =
            ShareToMessengerParams.newBuilder(uri, "audio/mpeg")
                    .setMetaData("{ \"audio\" : \"a1\" }")
                    .build();

if (mPicking) {
    MessengerUtils.finishShareToMessenger(this, shareToMessengerParams);
    } else {
    MessengerUtils.shareToMessenger(
            this,
            REQUEST_CODE_SHARE_TO_MESSENGER,
            shareToMessengerParams);
    }
}
private void onMessengerButtonClicked2() {
    Uri uri =
            Uri.parse("android.resource://" + getPackageName()+ "/raw/" +R.raw.a2);

    ShareToMessengerParams shareToMessengerParams =
            ShareToMessengerParams.newBuilder(uri, "audio/mpeg")
                    .setMetaData("{ \"audio\" : \"a2\" }")
                    .build();

    if (mPicking) {
        MessengerUtils.finishShareToMessenger(this, shareToMessengerParams);
    } else {
        MessengerUtils.shareToMessenger(
                this,
                REQUEST_CODE_SHARE_TO_MESSENGER,
                shareToMessengerParams);
    }
}
protected void onPause() {
    super.onPause();
    if (mp != null) {
        mp.stop();
        mp.release();
        mp = null;
    }
}

Answer 1

https://developer.android.com/guide/components/activities/activity-lifecycle.html

以上是可以在包括您的情况在内的广泛领域中使用的概要。

至于您的代码，您可以实现以下内容：

 @Override
    public void onResume() {
        mp.onResume();
        // Setup the player
        mp.resume();
    }
@Override
    public void onDestroy() {
        if(mp != null) {
            mp.release();
        }
        super.onDestroy();
    }
 s1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(mp != null)

                {
                    mp.stop();
                    mp.release();
                }
                finish();
            }
        });
}

如果有帮助，请使用日志来帮助您查看生命周期

try{
    if(mp !=null && mp.isPlaying()){
       Log.d("TAG------->", "player is running");
       mp.stop();
       Log.d("Tag------->", "player is stopped");
       mp.release();
       Log.d("TAG------->", "player is released");
    }
}catch(Exception e){
   //Throw the error
}

滚动我的应用程序真的不顺利

1 个答案: