稳扎稳打_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