移动应用开发实例——视频播放器

工具：Android Studio

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
    tools:context=".MainActivity">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <EditText
            android:id="@+id/et_path"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint ="请输入视频文件的路径"
            android:layout_toLeftOf="@+id/bt_play" />
        <ImageView
            android:id="@+id/bt_play"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:src="@android:drawable/ic_media_play" />
    </RelativeLayout>
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_below="@+id/play">
        <VideoView
            android:id="@+id/video_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>
    </LinearLayout>
</LinearLayout>

MainActivity.java

package com.example.service;
import androidx.appcompat.app.AppCompatActivity;
import android.media.MediaPlayer;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.MediaController;
import android.widget.VideoView;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    private EditText et_path;
    private ImageView bt_play;
    private VideoView videoView;
    private MediaController controller;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et_path = (EditText)findViewById(R.id.et_path);
        bt_play = (ImageView)findViewById(R.id.bt_play);
        controller = new MediaController(this);
        videoView.setMediaController(controller);
        bt_play.setOnClickListener(this);
    }
    @Override
    public void onClick(View v){
        switch (v.getId()){
            case R.id.bt_play:
                play();
                break;
        }
    }
    //播放视频
    private void play(){
        if(videoView != null && videoView.isPlaying()){
            bt_play.setImageResource(android.R.drawable.ic_media_play);
            videoView.stopPlayback();
            return;
        }
        videoView.setVideoPath(et_path.getText().toString());
        videoView.start();
        bt_play.setImageResource(android.R.drawable.ic_media_pause);
        videoView.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                bt_play.setImageResource(android.R.drawable.ic_media_play);
            }
        });
    }
}