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