Android--软件安装器Install

      我这里有一个Android2.1版本的软件安装器，只要把apk导入虚拟手机的SD卡，在EditText中填入软件的名称(如:youku.apk),单击安装即可。

public class InstallActivity extends Activity {
	private EditText filenameText ;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        filenameText = (EditText) this.findViewById(R.id.filename);
        Button button = (Button) this.findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {			
			@Override
			public void onClick(View v) {
				Intent intent = new Intent();   //隐式意图
				intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
				intent.setAction(android.content.Intent.ACTION_VIEW);
				Uri uri = Uri.fromFile(new File(Environment.getExternalStorageDirectory(),
						filenameText.getText().toString()));
				intent.setDataAndType(uri, "application/vnd.android.package-archive");
				startActivity(intent);
			}
		});
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="安装文件"
    />
    
    <EditText
	    android:layout_width="fill_parent" 
	    android:layout_height="wrap_content" 
	    android:text="videoplayer.apk"
	    android:id="@+id/filename"
	    />
	    
	    <Button
		    android:layout_width="wrap_content" 
		    android:layout_height="wrap_content" 
		    android:text="安装"
		    android:id="@+id/button"
		    />
</LinearLayout>