Android 弹出通知Toast的使用

//官方帮助文档：http://wear.techbrood.com/guide/topics/ui/notifiers/toasts.html

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <Button android:id="@+id/btnShowShort"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="show short"/>

	<Button android:id="@+id/btnShowLong"
	        android:layout_width="fill_parent"
	        android:layout_height="wrap_content"
	        android:text="show long"/>

	<Button android:id="@+id/btnShowDiy"
	        android:layout_width="fill_parent"
	        android:layout_height="wrap_content"
	        android:text="show diy"/>

	<Button android:id="@+id/btnShowImage"
	        android:layout_width="fill_parent"
	        android:layout_height="wrap_content"
	        android:text="show image"/>
</LinearLayout>

	private Button btnShowShort;
	private Button btnShowLong;
	private Button btnShowDiy;
	private Button btnShowImage;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btnShowShort=(Button) findViewById(R.id.btnShowShort);
        btnShowShort.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				Toast.makeText(MainActivity.this, "show short",Toast.LENGTH_SHORT).show();
			}
		});

        btnShowLong=(Button) findViewById(R.id.btnShowLong);
        btnShowLong.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				Toast.makeText(MainActivity.this, "show long",Toast.LENGTH_LONG).show();
			}
		});

        btnShowDiy=(Button) findViewById(R.id.btnShowDiy);
        btnShowDiy.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				Toast toast=Toast.makeText(MainActivity.this, "show diy",Toast.LENGTH_LONG);
				toast.setGravity(Gravity.CENTER, 100, 100);
				toast.show();
			}
		});

        btnShowImage=(Button) findViewById(R.id.btnShowImage);
        btnShowImage.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				Toast toast=Toast.makeText(MainActivity.this, "show long",Toast.LENGTH_LONG);
				ImageView image=new ImageView(MainActivity.this);
				image.setImageResource(R.drawable.cool);
				toast.setView(image);
				toast.show();
			}
		});
    }

效果：