import java.io.File;import android.app.Activity;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.view.View;import android.widget.Button;public class MainActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                  Button installBtn = (Button)findViewById(R.id.install_btn);        installBtn.setOnClickListener(new View.OnClickListener() {			@Override			public void onClick(View v) {				Intent intent = new Intent(Intent.ACTION_VIEW);				intent.setDataAndType(Uri.fromFile(new File("/sdcard/xxx.apk")), 						"application/vnd.android.package-archive");								startActivity(intent);			}		});                        Button uninstallBtn = (Button)findViewById(R.id.uninstall_btn);        uninstallBtn.setOnClickListener(new View.OnClickListener() {			@Override			public void onClick(View v) {				Uri uri = Uri.parse("package:com.xxx.xxx(包名)");				Intent intent2 = new Intent(Intent.ACTION_DELETE, uri);  		// package 一定要有 后面是包名 。系统软件不能卸载				MainActivity.this.startActivity(intent2);			}		});    }}

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