Go语言视频零基础入门到精通

痴迷编程

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();
复制代码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();
复制代码5.其他线程


代码
new Thread(new Runnable() {

    public void run() {

     showToast();

    }

   }).start();
复制代码完整代码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;

  }

}

}


复制代码2.main,xml <?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

androidrientation="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>


复制代码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>


复制代码

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