//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：