Question

我是新来的，我一直在寻找让我的应用播放声音的方法，并在点击按钮时在后台更改图像。该应用程序非常简单，它具有图像和按钮的相对布局。我已经让它播放声音，但它并没有改变屏幕上的图像。

我找到了如何更改屏幕上的图像以及如何播放声音，但我无法在同一个按钮点击时同时进行这两种操作。

这里是我的布局代码

<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"
    tools:context="us.xago.chtmpier.MainActivity">

    <ImageView
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:src="@drawable/pier"
         android:scaleType="centerCrop"/>
    <ImageView
         android:id="@+id/alfredo"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:src="@drawable/alfredo"
         android:scaleType="centerCrop"/>

     <Button
         android:layout_centerHorizontal="true"
         android:layout_alignParentBottom="true"
         android:id="@+id/button1"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="CHTM PIER"/>
 </RelativeLayout>

和java

 import android.support.v7.app.AppCompatActivity;
 import android.media.MediaPlayer;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.ImageView;

 public class MainActivity extends AppCompatActivity {
     ImageView alfredo;

     @Override
    protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
         alfredo = (ImageView) findViewById(R.id.alfredo);
         //set invisible
         alfredo.setVisibility(View.INVISIBLE);
         alfredo.setOnClickListener(new OnClickListener() {
             public void onClick(View v) {
              //show image on the center of screen
              //set image
              alfredo.setImageResource(R.drawable.alfredo);
             // set visible
             alfredo.setVisibility(View.VISIBLE);
           }
       });

     Button one = (Button) this.findViewById(R.id.button1);

      alfredo.setOnClickListener(new OnClickListener() {
           public void onClick(View v) {
              //show image on the center of screen
             //set image
             // set visible
             alfredo.setVisibility(View.VISIBLE);

         }
      });
        final MediaPlayer mp = MediaPlayer.create(this, R.raw.chtmpier);
        one.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            mp.start();
            }
        });
      }
 }

Answer 1

你必须在Button的Listener中编写你想要执行的任何内容。在这种情况下，两件事，图像可见性和音乐播放

// Search and initialize ImageView state
alfredo = (ImageView) findViewById(R.id.alfredo);
alfredo.setVisibility(View.INVISIBLE);

// Create Player
final MediaPlayer mp = MediaPlayer.create(this, R.raw.chtmpier);

// Search and initialize Button listener
Button one = (Button) this.findViewById(R.id.button1);

one.setOnClickListener(new OnClickListener() {

    public void onClick(View v) {
        /* This will be executed when the button is pressed  */
        // Show picture
        alfredo.setVisibility(View.VISIBLE);
        // Play music
        mp.start();
    }
});

Answer 2

最简单的方法是重用您的侦听器，因此您必须将其存储在变量中。之后，您可以在按钮侦听器上重用侦听器。

import android.support.v7.app.AppCompatActivity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {
    ImageView alfredo;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        alfredo = (ImageView) findViewById(R.id.alfredo);
        //set invisible
        alfredo.setVisibility(View.INVISIBLE);

        final OnClickListener changeImage = new OnClickListener() {
            public void onClick(View v) {
                //show image on the center of screen
                //set image
                alfredo.setImageResource(R.drawable.alfredo);
                // set visible
                alfredo.setVisibility(View.VISIBLE);
            }
        }

        alfredo.setOnClickListener(changeImage);

        Button one = (Button) this.findViewById(R.id.button1);

        final MediaPlayer mp = MediaPlayer.create(this, R.raw.chtmpier);
        one.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                mp.start();
                changeImage.onClick(v);
            }
        });
    }
}

Answer 3

要更改ImageView并使用Button播放声音，只需使用Button.setOnClickListener()。您可以使用您在问题中创建的变量来执行此类操作：

// Initializes the MediaPlayer to play the sound
MediaPlayer mp = MediaPlayer.create(this, R.raw.chtmpier); 

one.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        // Changes the image to another one
        alfredo.setImageResource(R.drawable.alfredo); // Replace with whatever image
        // Ensures it is visible
        alfredo.setVisibility(View.VISIBLE);

        // Plays the sound
        mp.start();
    }
});

希望它有所帮助！

Answer 4

您的要求非常简单，您的代码应该是这样的

 import android.support.v7.app.AppCompatActivity;
 import android.media.MediaPlayer;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.ImageView;

 public class MainActivity extends AppCompatActivity {
     ImageView alfredo;

     @Override
    protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         alfredo = (ImageView) findViewById(R.id.alfredo);

         final MediaPlayer mp = MediaPlayer.create(this, R.raw.chtmpier);
         Button one = (Button) this.findViewById(R.id.button1);
         one.setOnClickListener(new OnClickListener() {
                 public void onClick(View v) {
                  //show image on the center of screen
                  //set image
                  alfredo.setImageResource(R.drawable.alfredo);
                  mp.start();

               }
           });  
      }
 }

如何使用按钮更改图像并播放声音？

4 个答案: