Android 设置屏幕亮度调节源代码_android开发修改屏幕亮度

public class SetUpActivity extends AppCompatActivity {

private TextView btnReturnTrend;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_set_up);
    if (Build.VERSION.SDK_INT >= 21) {
        View decorView = getWindow().getDecorView();
        int option = View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                | View.SYSTEM_UI_FLAG_LAYOUT_STABLE;
        decorView.setSystemUiVisibility(option);
        getWindow().setNavigationBarColor(Color.TRANSPARENT);
        getWindow().setStatusBarColor(Color.TRANSPARENT);
    }

    btnReturnTrend = findViewById(R.id.btnReturn);
    btnReturnTrend.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            startActivity(new Intent(SetUpActivity.this,MainActivity.class));
            finish();
        }
    });


    SeekBar seekBar = findViewById(R.id.seekBar);

    // 进度条绑定最大亮度，255是最大亮度
    seekBar.setMax(255);
    // 取得当前亮度
    int normal = Settings.System.getInt(getContentResolver(),
            Settings.System.SCREEN_BRIGHTNESS, 255);
    // 进度条绑定当前亮度
    seekBar.setProgress(normal);

    seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {


            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                //判断是否可以写入数据到系统
                if (!Settings.System.canWrite(SetUpActivity.this)) {
                 /*   Intent i = new Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS);
                    i.setData(Uri.parse("package:" + SetUpActivity.this.getPackageName()));
                    i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    SetUpActivity.this.startActivity(i);*/
                    Intent intent = new Intent(android.provider.Settings.ACTION_MANAGE_WRITE_SETTINGS);
                    intent.setData(Uri.parse("package:" + getApplicationContext().getPackageName()));
                    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    getApplicationContext().startActivity(intent);
                } else {

                    //处理逻辑
                    // 取得当前进度
                    int tmpInt = seekBar.getProgress();

                    // 当进度小于80时，设置成80，防止太黑看不见的后果。
                    if (tmpInt < 80) {
                        tmpInt = 80;
                    }

                    // 根据当前进度改变亮度
                    Settings.System.putInt(getContentResolver(),
                            Settings.System.SCREEN_BRIGHTNESS, tmpInt);
                    tmpInt = Settings.System.getInt(getContentResolver(),
                            Settings.System.SCREEN_BRIGHTNESS, -1);
                    WindowManager.LayoutParams wl = getWindow().getAttributes();

                    float tmpFloat = (float) tmpInt / 255;
                    if (tmpFloat > 0 && tmpFloat <= 1) {
                        wl.screenBrightness = tmpFloat;
                    }
                    getWindow().setAttributes(wl);
                }
            }

        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {
            // TODO Auto-generated method stub
        }

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress,
                                      boolean fromUser) {
            // TODO Auto-generated method stub
        }
    });
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93

}