Android UI control series: Toast (prompt)

Toast is used to show some help/tips to the user. Below I have created 5 effects to illustrate the power of Toast and define a Toast of your own.

Note:

LENGTH_LONG—Display the view or text prompt for a long time

LENGTH_SHORT—Display the view or text prompt for a short time

setGravity(int gravity,int xOffset, int yOffset)—Set the position where the prompt should be displayed on the screen

setDuration(int duartion)—Set the duration of the prompt display
1.Default effect

Code

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

2. Customized display position effect

##Code

toast = Toast.makeText(getApplicationContext(),  
 "自定义位置Toast", Toast.LENGTH_LONG);  
 toast.setGravity(Gravity.CENTER, 0, 0);  
 toast.show();

3.With picture effect

Code

toast = Toast.makeText(getApplicationContext(),  
     "带图片的Toast", Toast.LENGTH_LONG);  
   toast.setGravity(Gravity.CENTER, 0, 0);  
   LinearLayout toastView = (LinearLayout) toast.getView();  
   ImageView imageCodeProject = new ImageView(getApplicationContext());  
   imageCodeProject.setImageResource(R.drawable.icon);  
   toastView.addView(imageCodeProject, 0);  
   toast.show();

4. Fully customized effect

Code

LayoutInflater inflater = getLayoutInflater();  
   View layout = inflater.inflate(R.layout.custom,  
     (ViewGroup) findViewById(R.id.llToast));  
   ImageView image = (ImageView) layout  
     .findViewById(R.id.tvImageToast);  
   image.setImageResource(R.drawable.icon);  
   TextView title = (TextView) layout.findViewById(R.id.tvTitleToast);  
   title.setText("Attention");  
   TextView text = (TextView) layout.findViewById(R.id.tvTextToast);  
   text.setText("完全自定义Toast");  
   toast = new Toast(getApplicationContext());  
   toast.setGravity(Gravity.RIGHT | Gravity.TOP, 12, 40);  
   toast.setDuration(Toast.LENGTH_LONG);  
   toast.setView(layout);  
   toast.show();

5. Other threads

##Code

new Thread(new Runnable() {  
    public void run() {  
     showToast();  
    }  
   }).start();

Complete code

1.Main,java

package com.wjq.toast;<br>import android.app.Activity;<br>import android.os.Bundle;
<br>import android.os.Handler;<br>import android.view.Gravity;<br>import android.view.LayoutInflater;
<br>import android.view.View;<br>import android.view.ViewGroup;<br>import android.view.View.OnClickListener;
<br>import android.widget.ImageView;<br>import android.widget.LinearLayout;<br>import android.widget.TextView;
<br>import android.widget.Toast;<br>public class Main extends Activity implements OnClickListener 
{<br>Handler handler = new Handler();<br>@Override<br>public void onCreate(Bundle savedInstanceState) 
{<br>  super.onCreate(savedInstanceState);<br>  setContentView(R.layout.main);<br>  
findViewById(R.id.btnSimpleToast).setOnClickListener(this);<br> 
findViewById(R.id.btnSimpleToastWithCustomPosition).setOnClickListener(<br>    this);<br>  
findViewById(R.id.btnSimpleToastWithImage).setOnClickListener(this);<br>  findViewById(R.id.btnCustomToast).setOnClickListener(this);<br>  
findViewById(R.id.btnRunToastFromOtherThread).setOnClickListener(this);<br>}<br>public void showToast() {<br>  handler.post(new Runnable() {<br>   @Override<br>
   public void run() {<br>    Toast.makeText(getApplicationContext(), "我来自其他线程！",<br>      Toast.LENGTH_SHORT).show();<br>   }<br>  });<br>}<br>@Override
   <br>public void onClick(View v) {<br>  Toast toast = null;<br>  switch (v.getId()) {<br>  case R.id.btnSimpleToast:<br>   
   Toast.makeText(getApplicationContext(), "默认Toast样式",<br>     Toast.LENGTH_SHORT).show();<br>   break;<br>  case R.id.btnSimpleToastWithCustomPosition:<br> 
     toast = Toast.makeText(getApplicationContext(),<br>     "自定义位置Toast", Toast.LENGTH_LONG);<br>   toast.setGravity(Gravity.CENTER, 0, 0);<br>   
     toast.show();<br>   break;<br>  case R.id.btnSimpleToastWithImage:<br>   toast = Toast.makeText(getApplicationContext(),
     "带图片的Toast", Toast.LENGTH_LONG);
   toast.setGravity(Gravity.CENTER, 0, 0);
   LinearLayout toastView = (LinearLayout) toast.getView();
   ImageView imageCodeProject = new ImageView(getApplicationContext());
   imageCodeProject.setImageResource(R.drawable.icon);
   toastView.addView(imageCodeProject, 0);
   toast.show();<br>   break;<br>  case R.id.btnCustomToast:<br>   LayoutInflater inflater = getLayoutInflater();
   View layout = inflater.inflate(R.layout.custom,
     (ViewGroup) findViewById(R.id.llToast));
   ImageView image = (ImageView) layout
     .findViewById(R.id.tvImageToast);
   image.setImageResource(R.drawable.icon);
   TextView title = (TextView) layout.findViewById(R.id.tvTitleToast);
   title.setText("Attention");
   TextView text = (TextView) layout.findViewById(R.id.tvTextToast);
   text.setText("完全自定义Toast");
   toast = new Toast(getApplicationContext());
   toast.setGravity(Gravity.RIGHT | Gravity.TOP, 12, 40);
   toast.setDuration(Toast.LENGTH_LONG);
   toast.setView(layout);
   toast.show();<br>   break;<br>  case R.id.btnRunToastFromOtherThread:<br>   new Thread(new Runnable() {
    public void run() {
     showToast();
    }
   }).start();<br>   break;<br>  }<br>}<br>}

2.main,xml

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
android:orientation="vertical" android:layout_width="fill_parent"  
android:layout_height="fill_parent" android:padding="5dip" android:gravity="center">  
<Button android:layout_height="wrap_content"  
  android:layout_width="fill_parent" android:id="@+id/btnSimpleToast"  
  android:text="默认"></Button>  
<Button android:layout_height="wrap_content"  
  android:layout_width="fill_parent" android:text="自定义显示位置"  
  android:id="@+id/btnSimpleToastWithCustomPosition"></Button>  
<Button android:layout_height="wrap_content"  
  android:layout_width="fill_parent" android:id="@+id/btnSimpleToastWithImage"  
  android:text="带图片"></Button>  
<Button android:layout_height="wrap_content"  
  android:layout_width="fill_parent" android:text="完全自定义"  
  android:id="@+id/btnCustomToast"></Button>  
<Button android:layout_height="wrap_content"  
  android:layout_width="fill_parent" android:text="其他线程"  
  android:id="@+id/btnRunToastFromOtherThread"></Button>  
</LinearLayout>

3.custom.xml

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout  
xmlns:android="http://schemas.android.com/apk/res/android"  
android:layout_height="wrap_content" android:layout_width="wrap_content"  
android:background="#ffffffff" android:orientation="vertical"  
android:id="@+id/llToast" >  
<TextView  
  android:layout_height="wrap_content"  
  android:layout_margin="1dip"  
  android:textColor="#ffffffff"  
  android:layout_width="fill_parent"  
  android:gravity="center"  
  android:background="#bb000000"  
  android:id="@+id/tvTitleToast" />  
<LinearLayout  
  android:layout_height="wrap_content"  
  android:orientation="vertical"  
  android:id="@+id/llToastContent"  
  android:layout_marginLeft="1dip"  
  android:layout_marginRight="1dip"  
  android:layout_marginBottom="1dip"  
  android:layout_width="wrap_content"  
  android:padding="15dip"  
  android:background="#44000000" >  
  <ImageView  
   android:layout_height="wrap_content"  
   android:layout_gravity="center"  
   android:layout_width="wrap_content"  
   android:id="@+id/tvImageToast" />  
  <TextView  
   android:layout_height="wrap_content"  
   android:paddingRight="10dip"  
   android:paddingLeft="10dip"  
   android:layout_width="wrap_content"  
   android:gravity="center"  
   android:textColor="#ff000000"  
   android:id="@+id/tvTextToast" />  
</LinearLayout>  
</LinearLayout>

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