Android UI控件系列：Toast（提示）

作者: 萝莉也狠美
来源: 51数据库
2020-08-16

Toast用于向用户显示一些帮助/提示。下面我做了5中效果，来说明Toast的强大，定义一个属于你自己的Toast。

注意：

LENGTH_LONG—长时间显示视图或文本提示
LENGTH_SHORT—短时间显示视图或文本提示
setGravity(int gravity,int xOffset,int yOffset)—设置提示应该在屏幕上的显示的位置
setDuration(int duartion)—设置提示显示的持续时间

1.默认效果

代码

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

2.自定义显示位置效果

代码

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

3.带图片效果

代码

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.完全自定义效果

代码

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.其他线程

代码

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

完整代码

1.Main,java

package com.wjq.toast;
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.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
public class Main extends Activity implements OnClickListener {
Handler handler = new Handler();
@Override
public void onCreate(Bundle savedInstanceState) {
? super.onCreate(savedInstanceState);
? setContentView(R.layout.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.icon);
? ?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.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();
? ?break;
? case R.id.btnRunToastFromOtherThread:
? ?new Thread(new Runnable() {
? ? public void run() {
? ? ?showToast();
? ? }
? ?}).start();
? ?break;
? }
}
}

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>