Android中Toast的使用

阳光穿透心脏的1/2处 2022-08-14 05:40 194阅读 0赞

## Android Toast的使用 ##

1.默认用法

Toast.makeText(getApplicationContext(), 
    "默认Toast", 
    Toast.LENGTH_SHORT).show();

*  getAppliationContext()可以获取到当前App下任意的位置所有的Context，既全局有效
 *  getContext表示获取当前对象所在的context
 *  this表示当前类是context的子类

## ![这里写图片描述][20151123223713932] ##

2.带图片的Toast

toast = Toast.makeText(getApplicationContext(),
                    "带图片的自定义Toast",
                    Toast.LENGTH_LONG);
                    toast.setGravity(Gravity.BOTTOM, 0, 0);
                    LinearLayout toastView = (LinearLayout) toast.getView();
                    ImageView iv = new ImageView(getApplicationContext());
                    iv.setImageResource(R.mipmap.ic_launcher);
                    toastView.addView(iv, 0);
                    toast.show();

*  toastView.addView() //0表示文本在下方,1表示文本在上方
 *  toast.setGravity(Gravity.BOTTOM, 0, 0); //设置显示位置
 *  在Toast的Layout中加入ImageView显示图片

## ![这里写图片描述][20151123223732479] ##

3.完全自定义的Toast

LayoutInflater inflater = getLayoutInflater();
                    View layout = inflater.inflate(R.layout.toastcustom, (ViewGroup) findViewById(R.id.layoutCustomL1));
    
                    ImageView imageView = (ImageView) layout.findViewById(R.id.ivCustomImage);
                    imageView.setImageResource(R.mipmap.ic_launcher);
    
                    TextView title = (TextView) layout.findViewById(R.id.tvCustomTitle);
                    title.setText("这是标题");
                    TextView text = (TextView) layout.findViewById(R.id.tvCUstomText);
                    text.setText("这是自定义的内容");
    
                    toast = new Toast(getApplicationContext());
                    toast.setGravity(Gravity.BOTTOM,0,0);
                    toast.setDuration(Toast.LENGTH_SHORT);
                    toast.setView(layout);
                    toast.show();

*  inflater用来找res/layout/下的XML文件，并且实例化，
 *  findViewById()是找XML文件下的具体的widget控件（如Button，TextView）
 *  对于没有被载入或者想要动态载入的界面需要用LayoutInflater.inflate()载入
 *  对于已经载入的界面，可以用findViewById()来获得其中的界面元素
 *  获得LayoutInflater实例的方式

- LayoutInflater inflater = getLayoutInflater();//调用Activity的getLayoutInflater()  - LayoutInflater inflater = LayoutInflater.from(context);  - LayoutInflater inflater = (LayoutInflater)context.getSystemService                               (Context.LAYOUT_INFLATER_SERVICE);

*  自定义Toast思路：  
    \-定义一个Toast Layout布局  
    \-在布局中加入imageView和TextView  
    \-载入imageView和TextView  
    \-设置imageView的属性  
    \-设置TextView的属性  
    \-设置Toast属性

![这里写图片描述][20151123223750340]

--------------------

## 代码及布局文件 ##

1.代码文件

package com.forcoding.omg;
    
    import android.os.Bundle;
    import android.support.design.widget.FloatingActionButton;
    import android.support.design.widget.Snackbar;
    import android.support.v7.app.AppCompatActivity;
    import android.view.Gravity;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.Button;
    import android.widget.ImageView;
    import android.widget.LinearLayout;
    import android.widget.TextView;
    import android.widget.Toast;
    
    public class Tos extends AppCompatActivity implements View.OnClickListener {
        private Button btnDefaultToast;
        private Button btnCustomLocationToast;
        private Button btnCustomPictureToast;
        private Button btnAllCustomToast;
        private Toast toast;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_tos);
        findViewById(R.id.btnDefaultToast).setOnClickListener(this);
            findViewById(R.id.btnCustomLocationToast).setOnClickListener(this);
            findViewById(R.id.btnCustomPictureToast).setOnClickListener(this);
            findViewById(R.id.btnAllCutsomToast).setOnClickListener(this);
    }
    
        public void onClick(View v) {
            Toast toast = null;
            switch (v.getId()){
                case R.id.btnDefaultToast:
                    toast.makeText(getApplicationContext(), "默认Toast", Toast.LENGTH_SHORT).show();
                    break;
                case R.id.btnCustomLocationToast:
                    toast = Toast.makeText(getApplicationContext(), "自定义的Toast",Toast.LENGTH_SHORT);
                    toast.setGravity(Gravity.CENTER,100,0);//竖直方向和水平方向偏移
                    toast.show();
                    break;
                case R.id.btnCustomPictureToast:
                    toast = Toast.makeText(getApplicationContext(),"带图片的自定义Toast",Toast.LENGTH_LONG);
                    toast.setGravity(Gravity.BOTTOM, 0, 0);
                    LinearLayout toastView = (LinearLayout) toast.getView();
                    ImageView iv = new ImageView(getApplicationContext());
                    iv.setImageResource(R.mipmap.ic_launcher);
                    toastView.addView(iv, 0);//0表示文本在下方,1表示文本在上方
                    toast.show();
    
                    break;
                case R.id.btnAllCutsomToast:
    
                    LayoutInflater inflater = getLayoutInflater();
                    View layout = inflater.inflate(R.layout.toastcustom, (ViewGroup) findViewById(R.id.layoutCustomL1));
    
                    ImageView imageView = (ImageView) layout.findViewById(R.id.ivCustomImage);
                    imageView.setImageResource(R.mipmap.ic_launcher);
    
                    TextView title = (TextView) layout.findViewById(R.id.tvCustomTitle);
                    title.setText("这是标题");
                    TextView text = (TextView) layout.findViewById(R.id.tvCUstomText);
                    text.setText("这是自定义的内容");
    
                    toast = new Toast(getApplicationContext());
                    toast.setGravity(Gravity.BOTTOM,0,0);
                    toast.setDuration(Toast.LENGTH_SHORT);
                    toast.setView(layout);
                    toast.show();
    
                    break;
    
            }
    
    
        }
    
    }

--------------------

2.布局文件

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" app:layout_behavior="@string/appbar_scrolling_view_behavior" tools:showIn="@layout/activity_toast" tools:context="com.example.forev.helloworld.Toasts">
    
        <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="默认" android:id="@+id/btnDefaultToast" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_marginTop="59dp" />
    
        <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="自定义显示位置" android:id="@+id/btnCustomLocationToast" android:layout_below="@+id/btnDefaultToast" android:layout_centerHorizontal="true" />
    
        <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="自定义带图片" android:id="@+id/btnCustomPictureToast" android:layout_below="@+id/btnCustomLocationToast" android:layout_centerHorizontal="true" />
    
        <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="完全自定义" android:id="@+id/btnAllCutsomToast" android:layout_below="@+id/btnCustomPictureToast" android:layout_alignStart="@+id/btnCustomPictureToast" />
    </RelativeLayout>

--------------------

3.自定义Toast布局文件

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/layoutCustomL1">
        <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/tvCustomTitle" android:layout_gravity="center" />
        <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" android:layout_gravity="center" android:id="@+id/layoutCustomL2">
    
    
            <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/ivCustomImage" android:layout_gravity="center" android:src="@mipmap/ic_launcher" />
            <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/tvCUstomText" android:layout_gravity="center" />
        </LinearLayout>
    </LinearLayout>

[20151123223713932]: /images/20220731/0af226b4b635407898beccc8dfad0209.png
[20151123223732479]: /images/20220731/d41929d040d44607b7813cf7cbbae25b.png
[20151123223750340]: /images/20220731/ca76c6c99ab1477ebeb85f656e20f97b.png