Android中Toast的用法简介

Toast是Android中用来显示显示信息的一种机制，和Dialog不一样的是，Toast是没有焦点的，而且Toast显示的时间有限，过一定的时间就会自动消失。下面用一个实例来看看如何使用Toast。

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 = newImageView(getApplicationContext());
imageCodeProject.setImageResource(R.drawable.icon);
toastView.addView(imageCodeProject, 0);
toast.show();

4.完全自定义效果

代码

LayoutInflaterinflater = 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 = newToast(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(newRunnable() {
public void run() {
showToast();
}
}).start();

完整代码

1.Main,java

packagecom.wjq.toast;

importandroid.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;
importandroid.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

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

@Override
public void onCreate(BundlesavedInstanceState) {
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 voidshowToast() {
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 = newImageView(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 = newToast(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

<?xmlversion="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">
<Buttonandroid:layout_height="wrap_content"
android:layout_width="fill_parent"android:id="@+id/btnSimpleToast"
android:text="默认"></Button>
<Buttonandroid:layout_height="wrap_content"
android:layout_width="fill_parent"android:text="自定义显示位置"
android:id="@+id/btnSimpleToastWithCustomPosition"></Button>
<Buttonandroid:layout_height="wrap_content"
android:layout_width="fill_parent"android:id="@+id/btnSimpleToastWithImage"
android:text="带图片"></Button>
<Buttonandroid: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

<?xmlversion="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>