步步为营_Android开发课[32]_用户界面之Toast（吐司）

Focus on technology, enjoy life！—— QQ：804212028
浏览链接：http://blog.csdn.net/y18334702058/article/details/44624305

• 主题：用户界面之Toast（吐司）
  -常用于APP中的一些小提示

Toast的结构分析：
Toast toast=Toast.makeText(MainActivity.this, “默认的Toast”, Toast.LENGTH_SHORT).show();

第一个参数：当前的上下文环境。可用getApplicationContext()或this .
第二个参数：要显示的字符串。也可是R.string中字符串ID
第三个参数：显示的时间长短。Toast默认的有两个LENGTH_LONG(长)和LENGTH_SHORT(短)，也可以使用毫秒如2000ms
最后显示toast信息 ：调用show()方法 。

Toast（实例）：

默认Toast效果：

自定义显示位置Toast效果：

自定义带图片Toast效果：

完全自定义Toast效果：

线程启动Toast效果：

实现代码：
activity_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>

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>

MainActivity.java:

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {
    Handler handler = new Handler();

 @Override
 public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);

      findViewById(R.id.btnSimpleToast).setOnClickListener(this);
      findViewById(R.id.btnSimpleToastWithCustomPosition).setOnClickListener(this);
      findViewById(R.id.btnSimpleToastWithImage).setOnClickListener(this);
      findViewById(R.id.btnCustomToast).setOnClickListener(this);
      findViewById(R.id.btnRunToastFromOtherThread).setOnClickListener(this);

 }

     public void showToast() {
      handler.post(new Runnable() {

       @Override
       public void run() {
        Toast.makeText(getApplicationContext(), "我来自其他线程！",
          Toast.LENGTH_SHORT).show();

       }
      });
     }

     @Override
     public void onClick(View v) {
         Toast toast = null;
      switch (v.getId()) {
      case R.id.btnSimpleToast:
          Toast.makeText(getApplicationContext(), "默认Toast样式",
          Toast.LENGTH_SHORT).show();
       break;
      case R.id.btnSimpleToastWithCustomPosition:
          toast = Toast.makeText(getApplicationContext(),"自定义位置Toast", Toast.LENGTH_LONG);
          toast.setGravity(Gravity.CENTER, 0, 0);
          toast.show();
       break;
      case R.id.btnSimpleToastWithImage:
          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.myimage);
          toastView.addView(imageCodeProject, 0);
          toast.show();
       break;
      case R.id.btnCustomToast:
           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.myimage);
           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.CENTER, 0, 0);
           toast.setDuration(Toast.LENGTH_LONG);
           toast.setView(layout);
           toast.show();
       break;
      case R.id.btnRunToastFromOtherThread:
           new Thread(new Runnable() {
            public void run() {
             showToast();
            }
           }).start();
       break;

      }
     }
}

Focus on technology, enjoy life！—— QQ：804212028
浏览链接：http://blog.csdn.net/y18334702058/article/details/44624305