• toast组件小结


    1. 简介:toast是“吐司”的意思,它属于android杂项组件,是一个简单的消息提示框,类似于javascript中的alert. 
    2. 作用
    • 显示文本
    • 显示图片
    • 显示图文

        3.常用方法

           show():显示消息提示框

           makeText(Context context,Charsquence text,int duration):创建一个toast对象

           setView(View view):该Toast显示的view组件

        4.代码演示

           

    MainActivity.class
    public class MainActivity extends AppCompatActivity {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
        }
        public void findOne(View v){
            Toast.makeText(this,"显示文本",Toast.LENGTH_LONG).show();
        }
        public void findTwo(View v){
            Toast toast = new Toast(this);
            ImageView imageView = new ImageView(this);
            imageView.setImageResource(R.drawable.ic_launcher);
            toast.setView(imageView);
            toast.setGravity(Gravity.TOP,0,0);
            toast.setDuration(Toast.LENGTH_LONG);
            toast.show();
        }
        public void findThree(View v){
            Toast toast = new Toast(this);
    
            TextView tv = new TextView(this);
            tv.setText("安卓开机图片");
    
            ImageView imageView = new ImageView(this);
            imageView.setImageResource(R.drawable.ic_launcher);
    
            LinearLayout layout = new LinearLayout(this);
            layout.setOrientation(LinearLayout.VERTICAL);
            layout.addView(imageView);
            layout.addView(tv);
            toast.setView(layout);
    
            toast.setGravity(Gravity.CENTER,0,0);
            toast.setDuration(Toast.LENGTH_LONG);
            toast.show();
        }
    
    }
    

      

    activity_main.xml
    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/activity_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        tools:context="com.langdon.taiyang.androidtest.MainActivity">
        <Button
            android:text="toast显示文本"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/toidOne"
            android:onClick="findOne"
            android:layout_gravity="center_horizontal"
             />
        <Button
            android:text="toast显示图片"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/toidTwo"
            android:onClick="findTwo"
            android:layout_gravity="center_horizontal"/>
        <Button
            android:text="toast显示图文"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/toidThree"
            android:onClick="findThree"
            android:layout_gravity="center_horizontal"/>
    </LinearLayout>
    

      

        5.注意点

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  • 原文地址:https://www.cnblogs.com/langdon/p/6095649.html
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