主界面代码

//更改 Toast 显示位置的技巧public class Hack16Activity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_hack16);    }    public void upperLeft(View v) {        Toast toast = Toast.makeText(this, "Upper Left!",                Toast.LENGTH_SHORT);        toast.setGravity(Gravity.TOP | Gravity.LEFT, 0, 0);        toast.show();    }    public void upperRight(View v) {        Toast toast = Toast.makeText(this, "Upper Right!",                Toast.LENGTH_SHORT);        toast.setGravity(Gravity.TOP | Gravity.RIGHT, 0, 0);        toast.show();    }    public void bottomLeft(View v) {        Toast toast = Toast.makeText(this, "Bottom Left!",                Toast.LENGTH_SHORT);        toast.setGravity(Gravity.BOTTOM | Gravity.LEFT, 0, 0);        toast.show();    }    public void bottomRight(View v) {        Toast toast = Toast.makeText(this, "Bottom Right!",                Toast.LENGTH_SHORT);        toast.setGravity(Gravity.BOTTOM | Gravity.RIGHT, 0, 0);        toast.show();    }}

xml文件

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" >    <Button  android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:onClick="upperLeft" android:text="@string/activity_main_show_toast" />    <Button  android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_alignParentTop="true" android:onClick="upperRight" android:text="@string/activity_main_show_toast" />    <Button  android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:onClick="bottomLeft" android:text="@string/activity_main_show_toast" />    <Button  android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" android:onClick="bottomRight" android:text="@string/activity_main_show_toast" /></RelativeLayout>

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