Toast用法

应用场景:弹出提示信息

主界面:

代码如下：

 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); init(); } private void init() { defaultToastBtn = (Button) findViewById(R.id.defaultToastBtn); customLocationBtn = (Button) findViewById(R.id.customLocationBtn); imageToastBtn = (Button) findViewById(R.id.imageToastBtn); customToastBtn = (Button) findViewById(R.id.customToastBtn); otherThreadBtn = (Button) findViewById(R.id.otherThreadBtn); defaultToastBtn.setOnClickListener(this);// 设置监听
        customLocationBtn.setOnClickListener(this); imageToastBtn.setOnClickListener(this); customToastBtn.setOnClickListener(this); otherThreadBtn.setOnClickListener(this); }

1.默认样式的Toast

代码如下：

Toast.makeText(getApplicationContext(), "默认样式的Toast", Toast.LENGTH_SHORT).show();// 显示时间较短

2.自定义位置的Toast

代码如下：

Toast toast = Toast.makeText(getApplicationContext(), "自定义位置 的Toast", Toast.LENGTH_LONG);//显示时间较长 
toast.setGravity(Gravity.CENTER, 0, 0);// 居中显示 
toast.show();

3.带图片的Toast

代码如下：

Toast toast = Toast.makeText(getApplicationContext(), "带图片的Toast", 3000);// 显示时间也可以是数字
toast.setGravity(Gravity.TOP, 0, 0);// 最上方显示
LinearLayout toastLayout = (LinearLayout) toast.getView(); ImageView imageView = new ImageView(getApplicationContext()); imageView.setImageResource(R.drawable.icon); toastLayout.addView(imageView, 0);// 0 图片在文字的上方 ， 1 图片在文字的下方
toast.show();

4.完全自定义的Toast

代码如下：

LayoutInflater inflater = getLayoutInflater();// LayoutInflater对象
View layout = inflater.inflate(R.layout.custom_view, null); ImageView imageView = (ImageView) layout.findViewById(R.id.imageView); TextView text = (TextView) layout.findViewById(R.id.textView); imageView.setImageResource(R.drawable.icon); text.setText("完全自定义的Toast"); Toast toast = new Toast(getApplicationContext()); // 底部 、水平居中,X偏移50 Y偏移50
toast.setGravity(Gravity.CENTER_HORIZONTAL | Gravity.BOTTOM, 50, 50); toast.setDuration(Toast.LENGTH_SHORT); toast.setView(layout); toast.show();

5.来自其他线程的Toast

代码如下：

handler = new Handler(); new Thread(new Runnable() {  public void run() { show(); } }).start();

private void show() { handler.post(new Runnable() { @Override  public void run()
 { Toast.makeText(getApplicationContext(), "Hello,I come from other thread!", 5000).show(); } }); }

注：getApplicationContext()  表示它的生命周期是整个应用，应用摧毁它才被摧毁。