DialogFragment 生命周期

DialogFragment  生命周期

 I/###  DialogF: onCreate 1
 I/###  DialogF: onGetLayoutInflater 2
 I/###  DialogF: onCreateDialog 3
 I/###  DialogF: onCreateView 4
 I/###  DialogF: onStart 5
 I/###  DialogF: onResume 6


 I/###  DialogF: onCancel 7
 I/###  DialogF: onPause 8
 I/###  DialogF: onStop 9
 I/###  DialogF: onDestroyView 10
 I/###  DialogF: onDestroy 11
 I/###  DialogF: onDetach 12

在自定义的SurfaceView 上打开 DialogFragment

在自定义的SurfaceView 上打开 DialogFragment

myDialogFragment.show(((AppCompatActivity) getContext()).getSupportFragmentManager(), "text");



    @Override
    public boolean onTouchEvent(MotionEvent event) {
        boolean show = true;
        if (show) {
            AboutDialog aboutDialog = new AboutDialog(getContext());
            aboutDialog.show();
            Toast.makeText(getContext(), "xxxxxxxxxx", Toast.LENGTH_SHORT).show();
        } else {
            MyDialogFragment myDialogFragment = new MyDialogFragment();
            myDialogFragment.item("99");
            myDialogFragment.show(((AppCompatActivity) getContext()).getSupportFragmentManager(), "text");
        }
        return true;
    }

ldpi,mdpi,hdpi,xhdpi,xxhdpi,xxxhdpi

ldpi,mdpi,hdpi,xhdpi,xxhdpi,xxxhdpi

float xdpi = getResources().getDisplayMetrics().xdpi;
float ydpi = getResources().getDisplayMetrics().ydpi;

https://blog.csdn.net/guolin_blog/article/details/50727753
https://developer.android.com/reference/android/util/DisplayMetrics.html

AboutDialog の追加

AboutDialog の追加

    public class AboutDialog extends AlertDialog {
        private Context context;

        public AboutDialog(Context context) {
            super(context);
            this.context = context;
        }

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            LinearLayout li = (LinearLayout) LayoutInflater.from(context).inflate(R.layout.about_layout, null);
            TextView textView = li.findViewById(R.id.textView3);
            textView.setText(Html.fromHtml("<u>" + getString(R.string.GooglePlayStore) + "<u>"));
            Pattern pattern = Pattern.compile("");
            String url = getString(R.string.PlayURL);
            Linkify.addLinks(textView, pattern, url, null, null);
            setContentView(li);
        }
    }



<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingLeft="20dp"
    android:paddingTop="10dp"
    android:paddingRight="20dp"
    android:paddingBottom="30dp">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        app:srcCompat="@mipmap/ic_launcher_foreground" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="20dp"
        android:layout_weight="1"
        android:text="@string/app_name"
        android:textSize="30dp" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="20dp"
        android:layout_weight="1"
        android:text="@string/kankanla"
        android:textSize="20dp" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="20dp"
        android:layout_weight="1"
        android:text="@string/GooglePlayStore"
        android:textSize="20dp" />
</LinearLayout>

android app中如何获取电源锁保持屏幕常亮

android app中如何获取电源锁保持屏幕常亮

protected void screen_on() {

getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

}

protected void screen_off() {

getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

}

android 屏幕旋转

android 屏幕旋转

<activity android:name=".MainActivity"
android:screenOrientation="portrait">

纵向方向（显示的高度大于宽度）。

https://developer.android.com/guide/topics/manifest/activity-element.html

Android Dialog Title 非显现

Android Dialog Title 非显现

protected void dia() {
        NDaig nDaig = new NDaig(this);
        nDaig.requestWindowFeature(Window.FEATURE_NO_TITLE);
        nDaig.show();
 }

Android getDrawable，getColor 过时的替代方法

Android getDrawable，getColor 过时的替代方法

public class ContextCompat{}

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        RelativeLayout relativeLayout = (RelativeLayout) findViewById(R.id.activity_main);
        LinearLayout linearLayout = new LinearLayout(this);
        linearLayout.setOrientation(LinearLayout.VERTICAL);
        relativeLayout.addView(linearLayout);

        for (int i = 0; i < 3; i++) {
            ImageView imageView = new ImageView(this);
//          过时
//          imageView.setImageDrawable(getDrawable(R.drawable.android));
//          替代方法
            imageView.setImageDrawable(ContextCompat.getDrawable(getApplicationContext(), R.drawable.firefox));
            TextView textView = new TextView(this);
            textView.setBackgroundColor(ContextCompat.getColor(getApplicationContext(), android.R.color.holo_orange_dark));
            textView.setText(String.valueOf(i));
            imageView.setId(i);
            textView.setId(i);
            linearLayout.addView(imageView);
            linearLayout.addView(textView);
            imageView.setOnClickListener(this);
            textView.setOnClickListener(this);
        }
    }

    @Override
    public void onClick(View v) {
        String idinfo = "";
        switch (v.getId()) {
            case 1:
                idinfo = "Button1";
                break;
            case 2:
                idinfo = "Button2";
                break;
            case 0:
                idinfo = "Button1";
                break;
        }
        Toast.makeText(this, idinfo, Toast.LENGTH_SHORT).show();
    }
}

Android_Layout 用代码得到对象的高宽

Android_Layout 用代码得到对象的高宽

当设定 ViewGroup.LayoutParams 的设定优先。




 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button button = new Button(getApplicationContext());
        button.setText("Button");
//        ViewGroup.LayoutParams layoutParams = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
        ViewGroup.LayoutParams layoutParams = new ViewGroup.LayoutParams(500, 500);
        ViewGroup viewGroup = (ViewGroup) findViewById(R.id.activity_main);
        button.setHeight(400);
        button.setWidth(400);
//        viewGroup.addView(button);
        viewGroup.addView(button, layoutParams);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                RelativeLayout.LayoutParams rl = (RelativeLayout.LayoutParams) ((Button) v).getLayoutParams();
                System.out.println(rl.height);
                System.out.println(rl.width);
                System.out.println(((Button) v).getHeight());
                System.out.println(((Button) v).getWidth());
            }
        });
    }


当>>>>
        ViewGroup.LayoutParams layoutParams = new ViewGroup.LayoutParams(500, 500);
        ViewGroup viewGroup = (ViewGroup) findViewById(R.id.activity_main);
        button.setHeight(400);
        button.setWidth(400);
        viewGroup.addView(button, layoutParams);

结果
I/System.out: 500
I/System.out: 500
I/System.out: 500
I/System.out: 500


当>>>>
        button.setText("Button");
//        ViewGroup.LayoutParams layoutParams = new ViewGroup.LayoutParams(500, 500);
        ViewGroup viewGroup = (ViewGroup) findViewById(R.id.activity_main);
        button.setHeight(400);
        button.setWidth(400);
        viewGroup.addView(button);

结果
I/System.out: -2
I/System.out: -2
I/System.out: 400
I/System.out: 400

Android_Layout 用代码添加对象

Android LayoutParams

用代码添加对象（按键），并设置LayoutParames，
当按键Click时，变更LayoutParames 的值。

public class MainActivity extends AppCompatActivity {

    /**
     * https://www.youtube.com/watch?v=QSsvUbPVHOU&index=3&list=PLTstZD3AK3S9sR6uiKzmNtgnY5p4nMT3Z
     *
     * @param savedInstanceState
     */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       
        Button button = new Button(getApplicationContext());
        button.setText("Button");
        ViewGroup.LayoutParams layoutParams = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
        ViewGroup viewGroup = (ViewGroup) findViewById(R.id.activity_main);
//      "NG>>"  ViewGroup viewGroup = (ViewGroup) findViewById(R.layout.activity_main);
        viewGroup.addView(button, layoutParams);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                RelativeLayout.LayoutParams layoutParams1 = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
                ((Button) v).setLayoutParams(layoutParams1);
//                java.lang.ClassCastException: android.view.ViewGroup$LayoutParams cannot be cast to android.widget.RelativeLayout$LayoutParams
//                "NG>>" ViewGroup.LayoutParams layoutParams1 = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
//                Button bbt = (Button) v;
//                bbt.setLayoutParams(layoutParams1);
            }
        });
    }
}