Android Toast 工具类调用

package news.zxy.com.zhbj74;

import android.app.Activity;
import android.view.Gravity;
import android.widget.Toast;

/**
* Created by Administrator on 2016/6/17.
*/
//在屏幕中央显示Toast,封装成工具类
public class BaseActivity extends Activity {
public void showToast(CharSequence text) {
Toast toast = Toast.makeText(this, text, Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}

}

package news.zxy.com.zhbj74;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends BaseActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
showToast("继承BaseActivity后，这里就可以简单调用Toast了！");
}
}