安卓中黑客

第一步：在xml文件中编辑按钮

<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=".MainActivity" >

 

    <Button

        android:onClick="click"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:layout_centerVertical="true"

        android:text="读取qq的信息" />

 

</RelativeLayout>

第二步：在java中编辑逻辑

public class MainActivityextends Activity {

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

}

 

public void click(View view){

try {

File file = new File(this.getFilesDir(),"info.txt");

FileInputStream fis = new FileInputStream(file);

BufferedReader br = new BufferedReader(new InputStreamReader(fis));

String line = br.readLine();

Toast.makeText(this, line, 0).show();

} catch (Exception e) {

Toast.makeText(this,"读取失败", 0).show();

e.printStackTrace();

}

}

 

}