Android中实现播放和停止 画面切换

---

点击播放按钮后的画面如下：

---

上图的效果是点击播放按钮后，变成停止按钮，点击停止按钮后再变成播放按钮

---

---

界面布局如下：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:orientation="horizontal" >     <View             android:layout_weight="1"            android:layout_height="0dp"            android:layout_width="0dp"            />        <Button             android:layout_margin="3dp"            android:id="@+id/btn_scroll_up"            android:layout_width="35dp"            android:layout_height="35dp"            android:textColor="#ffffff"            android:background="@drawable/bo"            android:onClick="bofang"            />        <Button             android:id="@+id/btn_scroll_stop"            android:layout_width="35dp"            android:layout_height="35dp"            android:layout_margin="3dp"            android:background="@drawable/ting"            android:visibility="gone"            android:onClick="tingzhi"            /></LinearLayout>

---

---

入口Activity文件如下：

package com.wwe.sca;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.view.View;import android.widget.Button;public class MainActivity extends Activity {Button bb;Button tt;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.sss);        bb=(Button) findViewById(R.id.btn_scroll_up);        tt=(Button) findViewById(R.id.btn_scroll_stop);    }    public void bofang(View v) {      tt.setVisibility(View.VISIBLE);      bb.setVisibility(View.GONE);    }    public void tingzhi(View v) {          bb.setVisibility(View.VISIBLE);          tt.setVisibility(View.GONE);    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }}

---

---

FR:徐海涛（Hunk Xu) QQ技术交流群：386476712