Toast用法！！

一.基础的Toast   默认展示

// 第一个参数：当前的上下文环境。可用getApplicationContext()或this 

// 第二个参数：要显示的字符串。也可是R.string中字符串ID 

// 第三个参数：显示的时间长短。Toast默认的有两个LENGTH_LONG(长)和LENGTH_SHORT(短)，也可以使用毫秒如2000ms 

Toast toast=Toast.makeText(getApplicationContext(), "默认的Toast", Toast.LENGTH_SHORT); 

//显示toast信息 

toast.show(); 

二.自定义显示位置

Toast toast=Toast.makeText(getApplicationContext(), "自定义显示位置的Toast", Toast.LENGTH_SHORT); 

//第一个参数：设置toast在屏幕中显示的位置。我现在的设置是居中靠顶 

//第二个参数：相对于第一个参数设置toast位置的横向X轴的偏移量，正数向右偏移，负数向左偏移 

//第三个参数：同的第二个参数道理一样 

//如果你设置的偏移量超过了屏幕的范围，toast将在屏幕内靠近超出的那个边界显示 

toast.setGravity(Gravity.TOP|Gravity.CENTER, -50, 100);  

//屏幕居中显示，X轴和Y轴偏移量都是0 

//toast.setGravity(Gravity.CENTER, 0, 0);  

toast.show(); 

三、带图片的

Toast toast=Toast.makeText(getApplicationContext(), "显示带图片的toast", 3000);

toast.setGravity(Gravity.CENTER, 0, 0);  

//创建图片视图对象 

  ImageView imageView= new ImageView(getApplicationContext()); 

//设置图片 

imageView.setImageResource(R.drawable.ic_launcher); 

//获得toast的布局 

 LinearLayout toastView = (LinearLayout) toast.getView(); 

//设置此布局为横向的 

toastView.setOrientation(LinearLayout.HORIZONTAL); 

//将ImageView在加入到此布局中的第一个位置 

toastView.addView(imageView, 0); 

toast.show(); 

四、完全自定义显示方式

1. toast.xml布局

 toast.xml

2.代码

public class ToastActivityextends Activity {

    private Button bt;

    private ImageView image;

    private TextView title, content;

 

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        bt = (Button) findViewById(R.id.bt);

        bt.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                showToast();

            }

        });

    }

 

    private void showToast() {

        LayoutInflater inflater = getLayoutInflater();

        View view = inflater.inflate(R.layout.toast,null);

        image = (ImageView) view.findViewById(R.id.image);

        title = (TextView) view.findViewById(R.id.title);

        content = (TextView) view.findViewById(R.id.content);

        image.setBackgroundResource(R.drawable.ic_launcher);

        title.setText("自定义toast");

        content.setText("hello,self toast");

        Toast toast = new Toast(getApplicationContext());

        toast.setGravity(Gravity.CENTER, 0, 0);

        toast.setDuration(Toast.LENGTH_SHORT);

        toast.setView(view);

        toast.show();

    }

 

}

五、其他线程通过Handler的调用

//调用方法1

    //Thread th=new Thread(this);

    //th.start();

    //调用方法2

    handler.post(new Runnable() {

        @Override

        public void run() {

            showToast();

        }

    });

 

Java代码

public void showToast(){

        Toast toast=Toast.makeText(getApplicationContext(), "Toast在其他线程中调用显示", Toast.LENGTH_SHORT);

        toast.show();

    }

 

Java代码

Handler handler=new Handler(){

        @Override

        public void handleMessage(Message msg) {

            int what=msg.what;

            switch (what) {

            case 1:

                showToast();

                break;

            default:

                break;

            }

             

            super.handleMessage(msg);

        }

    };

 

Java代码

@Override

    public void run() {

        handler.sendEmptyMessage(1);

    }