安卓学习第27课——toast

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="简单提示" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="带图片提示" />

</LinearLayout>

package com.example.toast;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button simple=(Button) findViewById(R.id.button1);
        simple.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) {
                Toast toast=Toast.makeText(MainActivity.this,"简单的提示信息", Toast.LENGTH_SHORT);
                toast.show();
            }

        });
        Button bn=(Button) findViewById(R.id.button2);
        bn.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {
                Toast toast=new Toast(MainActivity.this);
                toast.setGravity(Gravity.CENTER, 0,0 );
                ImageView image=new ImageView(MainActivity.this);
                image.setImageResource(R.drawable.nongyu);
                LinearLayout ll=new LinearLayout(MainActivity.this);
                ll.addView(image);
                TextView textView=new TextView(MainActivity.this);
                textView.setTextSize(30);
                textView.setTextColor(Color.MAGENTA);
                textView.setText("带图片的提示信息");
                ll.addView(textView);
                toast.setView(ll);
                toast.setDuration(Toast.LENGTH_LONG);
                toast.show();
            }

        });
    }

}

代码中使用了两种方法，一个是直接用toast.makeText创建，还一个是用new Toast创建带图片的toast.