拨打电话-跳转相册--SharedPreferences

拨打电话-吊起拨打界面且拨打

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

跳转到相册

Intent intent = new Intent(Intent.ACTION_PICK,      
MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, 请求码);

 Uri uri = data.getData();
 
// 通过uri的方式返回，设置到图片组件上
 Uri uri = data.getData();
 iv_head.setImageURI(uri);

SharedPreferences的查询和获取数据

        //获取数据
        SharedPreferences user = getSharedPreferences("user", MODE_PRIVATE);

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


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

        // 保存数据
        user.edit().putString("key","hello world!").commit();

倒计时

  // 计时器，5秒每间隔一秒执行一次
        new CountDownTimer(5000,1000){

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

            @Override
            public void onFinish() {

                Log.d(TAG, "onFinish: 执行结束");
            }
        }.start();