Android消息提示框Toast

Android消息提示框Toast

Toast是Android中一种简易的消息提示框。和Dialog不一样的是，Toast是没有焦点的，toast提示框不能被用户点击，而且Toast显示的时间有限，toast会根据用户设置的显示时间后自动消失。

创建Toast的方法总共有2种：

1.Toast.makeText(Context context, (CharSequence text)/( int resId), int duration)

参数：context是指上下文对象，通常是当前的Activity,text是指自己写的消息内容，resId指显示内容引用Resource的那条数据，duration指Toast的显示时间，Toast默认有LENGTH_SHORT和LENGTH_LONG两常量，分别表示时间长和短，也可以自定义时间，如：5000表示显示5秒。用此方法获得Toast对象之后调用.show()方法即可显示消息。

2.自定义Toast,通过Toast toast = new Toast(Context context)获得Toast对象，调用.show()方法即可显示消息。

toast.setDuration(duration)设置显示时间，
toast.setGravity(gravity, xOffset, yOffset)设置显示位置，三个参数分别表示(起点位置,水平位移,垂直位移)，
toast.setMargin(float horizontalMargin, float verticalMargin)以横向和纵向的百分比设置显示位置，参数均为float类型(水平位移正右负左，竖直位移正上负下)，
toast.setText(text)设置消息内容，
toast.setView(view)设置Toast显示的视图组件。

实例：

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="10dp" >
<Button
    android:id="@+id/simpleToast"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="默认" >
</Button>
 
<Button
    android:id="@+id/simpleToastWithCustomPosition"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="自定义显示位置" >
</Button>
 
<Button
    android:id="@+id/imageToast"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="带图片" >
</Button>
 
<Button
    android:id="@+id/customToast"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="完全自定义" >
</Button>
 
<Button
    android:id="@+id/runToastFromOtherThread"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="其他线程" >
</Button>
</LinearLayout>

custom.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/toastLayout"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="1dp"
    android:background="#333399"
    android:gravity="center"
    android:text="ToastTitle"
    android:textColor="#ffffff" />
 
<LinearLayout
    android:id="@+id/toastContent"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="1dp"
    android:layout_marginLeft="1dp"
    android:layout_marginRight="1dp"
    android:background="#3366ff"
    android:orientation="vertical"
    android:padding="15dp" >
 
    <ImageView
        android:id="@+id/customImageToast"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center" />
 
    <TextView
        android:id="@+id/customTextToast"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:paddingLeft="10dp"
        android:paddingRight="10dp" />
</LinearLayout>
</LinearLayout>

MainActivity.java

public class MainActivity extends Activity implements OnClickListener {
     
private Button simpleToastBtn, simpleToastWithCustomPositionBtn,
		imageToastBtn, customToastBtn, runToastFromOtherThreadBtn;
Handler handler = new Handler();
 
@Override
protected void onCreate(Bundle savedInstanceState) {
     
	super.onCreate(savedInstanceState);
	setContentView(R.layout.main);
	simpleToastBtn = (Button) findViewById(R.id.simpleToast);
	simpleToastWithCustomPositionBtn = (Button) findViewById(R.id.simpleToastWithCustomPosition);
	imageToastBtn = (Button) findViewById(R.id.imageToast);
	customToastBtn = (Button) findViewById(R.id.customToast);
	runToastFromOtherThreadBtn = (Button) findViewById(R.id.runToastFromOtherThread);
 
	simpleToastBtn.setOnClickListener(this);
	simpleToastWithCustomPositionBtn.setOnClickListener(this);
	imageToastBtn.setOnClickListener(this);
	customToastBtn.setOnClickListener(this);
	runToastFromOtherThreadBtn.setOnClickListener(this);
}
 
@Override
public void onClick(View v) {
     
	Toast toast = null;
	switch (v.getId()) {
     
	case R.id.simpleToast:
		Toast.makeText(MainActivity.this, "默认Toast样式", Toast.LENGTH_LONG)
				.show();
		break;
 
	case R.id.simpleToastWithCustomPosition:
		toast = Toast.makeText(MainActivity.this, "自定义位置Toast",
				Toast.LENGTH_LONG);
		toast.setGravity(Gravity.CENTER, 0, 0);
		toast.show();
		break;
 
	case R.id.imageToast:
		toast = Toast.makeText(MainActivity.this, "带图片的Toast",
				Toast.LENGTH_LONG);
		LinearLayout layout = (LinearLayout) toast.getView();
		ImageView image = new ImageView(MainActivity.this);
		image.setImageResource(R.drawable.ic_launcher);
		layout.addView(image, 0);
		toast.show();
		break;
 
	case R.id.customToast:
		LayoutInflater inflater = getLayoutInflater();
		View view = inflater.inflate(R.layout.custom, null);
 
		ImageView customImage = (ImageView) view
				.findViewById(R.id.customImageToast);
		TextView customText = (TextView) view
				.findViewById(R.id.customTextToast);
		customImage.setImageResource(R.drawable.ic_launcher);
		customText.setText("完全自定义Toast");
 
		toast = new Toast(MainActivity.this);
		toast.setGravity(Gravity.RIGHT | Gravity.TOP, 30, 30);
		toast.setDuration(Toast.LENGTH_LONG);
		toast.setView(view);
		toast.show();
		break;
 
	case R.id.runToastFromOtherThread:
		new Thread(new Runnable() {
     
			public void run() {
     
				showToast();
			}
		}).start();
		break;
	}
}
 
public void showToast() {
     
	handler.post(new Runnable() {
     
		@Override
		public void run() {
     
			Toast.makeText(MainActivity.this, "我来自其他线程", Toast.LENGTH_LONG)
					.show();
		}
	});
}
}

作者:王韶刚

原文地址：https://blog.csdn.net/qq_41853555/article/details/106132822