撥打電話-吊起撥打界面且撥打

Uri uri = Uri.parse("tel:10086");
Intent intent = new Intent(Intent.ACTION_CALL, uri);
startActivity(intent);

跳轉(zhuǎn)到相冊

Intent intent = new Intent(Intent.ACTION_PICK,      
MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, 請求碼);

 Uri uri = data.getData();
 
// 通過uri的方式返回，設(shè)置到圖片組件上
 Uri uri = data.getData();
 iv_head.setImageURI(uri);

SharedPreferences的查詢和獲取數(shù)據(jù)

        //獲取數(shù)據(jù)
        SharedPreferences user = getSharedPreferences("user", MODE_PRIVATE);

        String key = user.getString("key", "");


       
        SharedPreferences user = getSharedPreferences("user", MODE_PRIVATE);

        // 保存數(shù)據(jù)
        user.edit().putString("key","hello world!").commit();

倒計(jì)時

  // 計(jì)時器，5秒每間隔一秒執(zhí)行一次
        new CountDownTimer(5000,1000){

            @Override
            public void onTick(long millisUntilFinished) {
                Log.d(TAG, "onTick: "+millisUntilFinished);
            }

            @Override
            public void onFinish() {

                Log.d(TAG, "onFinish: 執(zhí)行結(jié)束");
            }
        }.start();