<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical" >  <Button    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:onClick="onClickDefaultToast"    android:text="點(diǎn)擊顯示默認(rèn)位置的Toast" />  <Button    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:onClick="onClickCenterToast"    android:text="點(diǎn)擊顯示居中位置的Toast" />  <Button    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:onClick="onClickTopToast"    android:text="點(diǎn)擊顯示居中上部位置的Toast" /></LinearLayout>

package chengyujia.demo.aty;import android.os.Bundle;import android.view.Display;import android.view.Gravity;import android.view.View;import android.widget.Toast;import chengyujia.demo.R;public class ToastActivity extends BaseActivity {  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_toast);  }  public void onClickDefaultToast(View v) {    Toast.makeText(this, "默認(rèn)位置的Toast", Toast.LENGTH_LONG).show();  }  public void onClickCenterToast(View v) {    Toast toast = Toast.makeText(this, "居中位置的Toast", Toast.LENGTH_LONG);    toast.setGravity(Gravity.CENTER, 0, 0);    toast.show();  }  public void onClickTopToast(View v) {    Display display = getWindowManager().getDefaultDisplay();    // 獲取屏幕高度    int height = display.getHeight();    Toast toast = Toast.makeText(this, "居中上部位置的Toast", Toast.LENGTH_LONG);    // 這里給了一個(gè)1/4屏幕高度的y軸偏移量    toast.setGravity(Gravity.TOP, 0, height / 4);    toast.show();  }}