个人练习：返回系统Home桌面

1.MainActivity.java

public class MainActivity extends Activity
{
    private Button btnClick = null;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        btnClick = (Button) findViewById(R.id.btnClick);
        btnClick.setOnClickListener(listener);
        
    }

    OnClickListener listener = new OnClickListener()
    {
        
        @Override
        public void onClick(View v)
        {
            // TODO Auto-generated method stub
            switch (v.getId())
            {
            case R.id.btnClick:
                Intent intent = new Intent();
                intent.setAction(Intent.ACTION_MAIN);
                intent.addCategory(Intent.CATEGORY_HOME);
                startActivity(intent);
                break;
            }
        }
    };
}