Android更改Toast的默认位置方法

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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, "默认位置的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();
    // 获取屏幕高度
    int height = display.getHeight();
    Toast toast = Toast.makeText(this, "居中上部位置的Toast", Toast.LENGTH_LONG);
    // 这里给了一个1/4屏幕高度的y轴偏移量
    toast.setGravity(Gravity.TOP, 0, height / 4);
    toast.show();
  }
}