Android开发笔记

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<style name="AppTheme.NoActionBar">
    <!--状态栏颜色-->
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <!--控制各个控件被选中时的颜色-->
    <item name="colorAccent">@color/colorAccent</item>
    <!--页面背景色-->
    <item name="android:windowBackground">@color/windowBackg</item>
    <!--底部导航栏颜色-->
    <item name="android:navigationBarColor">@color/navigationColor</item>
    <!--Appbar背景色-->
    <item name="android:colorPrimary">@color/colorPrimary</item>
    <!--ToolBar上的Title颜色-->
    <item name="android:textColorPrimary">@color/textColorPrimary</item>
    <!--各个控制控件的默认颜色-->
    <item name="android:colorControlNormal">@color/colorControlNormal</	item>
</style>

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layout_constraintLeft_toLeftOf
layout_constraintLeft_toRightOf
layout_constraintTop_toTopOf
...

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layout_constraintTop_toTopOf
layout_constraintTop_toBottomOf
layout_constraintBottom_toTopOf
layout_constraintBottom_toBottomOf

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<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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">

<TextView
        android:id="@+id/tv_top_bg"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:fitsSystemWindows="true"
        android:maxHeight="140dp"
        android:background="@drawable/case_resource_transport_top_bg"
        app:layout_constraintTop_toTopOf="parent" />

...
</android.support.constraint.ConstraintLayout>

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   <activity android:name="....xxActivity"
        android:screenOrientation="portrait"
        android:theme="@style/AppTheme.imgFullScreen"
        android:windowSoftInputMode="adjustPan"/>

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<style name="AppTheme.imgFullScreen">
    <item name="android:windowTranslucentStatus">false</item>
    <item name="android:windowTranslucentNavigation">false</item>
    <item name="android:statusBarColor">@android:color/transparent</item>
</style>

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val decorView = window.decorView

val option = (View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.SYSTEM_UI_FLAG_LAYOUT_STABLE)
decorView.systemUiVisibility = option
window.statusBarColor = Color.TRANSPARENT

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package="com">
<activity android:name=".MainActivity">
    ……
</activity>
<service android:name=".XXX" />

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<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- This is the main color -->
    <item>
        <shape>
            <!--    边框颜色 -->
            <solid android:color="@color/flash_text_normal"/>
        </shape>
    </item>
    <!-- 给View的上 下  右设置8dp的边框 -->
    <!-- http://blog.csdn.net/lowprofile_coding/article/details/47848245-->
    <item android:top="1dip" android:bottom="1dip" android:right="1dip" >
        <shape>
            <!--     View填充颜色 -->
            <solid android:color="@color/public_round_yellow" />
            <corners 
                 android:topRightRadius="@dimen/x10"  
                 android:bottomRightRadius="@dimen/x10"  />
        </shape>
    </item>

</layer-list>

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<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >
   <solid android:color="#ffffff" />
   <stroke android:width="1dip" android:color="#4fa5d5"/>
</shape>

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package com.example.test;
 
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.widget.TextView;
 
@SuppressLint("DrawAllocation")
public class BorderTextView extends TextView{
 
	public BorderTextView(Context context) {
		super(context);
	}
	public BorderTextView(Context context, AttributeSet attrs) {
		super(context, attrs);
	}
	private int sroke_width = 1;
	@Override
	protected void onDraw(Canvas canvas) {
		Paint paint = new Paint();
        //  将边框设为黑色
        paint.setColor(android.graphics.Color.BLACK);
        //  画TextView的4个边
        canvas.drawLine(0, 0, this.getWidth() - sroke_width, 0, paint);
        canvas.drawLine(0, 0, 0, this.getHeight() - sroke_width, paint);
        canvas.drawLine(this.getWidth() - sroke_width, 0, this.getWidth() - sroke_width, this.getHeight() - sroke_width, paint);
        canvas.drawLine(0, this.getHeight() - sroke_width, this.getWidth() - sroke_width, this.getHeight() - sroke_width, paint);
		super.onDraw(canvas);
	}
}

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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    <TextView 
    android:layout_width="120dp"
    android:layout_height="80dp"
    android:background="@drawable/textview_border"
    android:text="方法二"
    android:textColor="#FF000000"
    android:id="@+id/test"
    android:gravity="center"
    android:layout_alignParentTop="true"
    android:layout_marginTop="20dp"
    android:layout_centerHorizontal="true"/>
 
	<com.example.test.BorderTextView
      android:layout_width="120dp"
      android:layout_height="80dp"
      android:text="方法三"
      android:id="@+id/test3"
      android:gravity="center"
      android:layout_alignParentBottom="true"
      android:layout_marginBottom="20dp"
      android:layout_centerHorizontal="true">
    </com.example.test.BorderTextView>
</RelativeLayout>

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import android.app.Application;

public class MusicPlayerStatus extends Application {
    private int update=-1;
    private int current=-1;

    public int getUpdate() {
        return update;
    }

    public void setUpdate(int update) {
        this.update = update;
    }

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        this.current = current;
    }
}

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public MusicPlayerStatus musicPlayerStatus=new MusicPlayerStatus();
int update = musicPlayerStatus.getUpdate();
int current = musicPlayerStatus.getCurrent();
musicPlayerStatus.setUpdate(update);
musicPlayerStatus.setCurrent(current);

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/**
*第一个 Fragment 需要处理  setUserVisVleHint（）方法，设置为 setUserVisibleHint(true);
*否则会产空指针异常，因为 setUserVisVleHint（）方法的优先级高于 onCreate（）方法。
*
* @param savedInstanceState
*/
@Override
public void onActivityCreated(Bundle savedInstanceState) {
    setUserVisibleHint(true);
    super.onActivityCreated(savedInstanceState);
}
 /*
主动调用 setUserVisibleHint（）方法来控制第一次不会调用setUserVisibleHint方法的问题。
setUserVisibleHint（）方法优先onCreateView方法，当onCreateView方法调用后还会再次调用setUserVisibleHint方法。
此时要对是否调用了onCreateView（）方法进行标记判断。
*/

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 protectedvoidonMeasure(intwidthMeasureSpec,intheightMeasureSpec){
     Drawable d = getDrawable();
     if(d!=null){
         // ceil not round - avoid thin vertical gaps along the left/right 
         edgesintwidth = MeasureSpec.getSize(widthMeasureSpec);
         //高度根据使得图片的宽度充满屏幕计算而得 
         intheight = (int) Math.ceil((float) width * (float) d.getIntrinsicHeight() / (float) d.getIntrinsicWidth());
     setMeasuredDimension(width, height);
     }else{
         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
     }
 }

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//宽度填满屏幕
 android:layout_width=”match_parent”
 android:scaleType=”fitXY”
 android:layout_height=”wrap_content”
 //保持比例，一定要设置
 android:adjustViewBounds=”true”

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public Handler mHandler=new Handler(){  
        public void handleMessage(Message msg) {  
        switch(msg.what){  
            case CANSHU :   String str1 = msg.getData().getString("text1");//接受msg传递过来的参数   
                    String str2 = msg.getData().getString("text2");//接受msg传递过来的参数   
                    initFinishMainActivity(str1, str2);  
                              break;  
            default         : break;  
            }  
        }     
    };  

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Message msg = new Message();  
            msg.what = MainActivity.CANSHU;  
            Bundle bundle = new Bundle();    
                      bundle.putString("text1","大明的消息传递参数的例子！");  //往Bundle中存放数据   
                         bundle.putString("text2","Time：2011-09-05");  //往Bundle中put数据   
                         msg.setData(bundle);//mes利用Bundle传递数据   
                         activity.mHandler.sendMessage(msg);//用activity中的handler发送消息   

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public class Persion implements Serializable {
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

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public Handler mHandler=new Handler(){  
        public void handleMessage(Message msg) {  
        switch(msg.what){  
            case CANSHU :   
                Persion persion=(Persion)(msg.getData().getSerializable("persion"));
                //接受msg传递过来的参数
                initFinishMainActivity(persion);  
                break;  
            default: 
                break;  
            }  
        }     
    };  

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Message msg = new Message();  
msg.what = MainActivity.CANSHU; 
Persion persion=new Persion();
String Name="zhangsan";
persion.setName(Name);
Bundle bundle = new Bundle();    
bundle.putSerializable("persion",persion); 
//往Bundle中存放数据   
msg.setData(bundle);//mes利用Bundle传递数据   
activity.mHandler.sendMessage(msg);//用activity中的handler发送消息   

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<?xml version="1.0" encoding="utf-8"?>
    <ImageButton
        android:layout_width="100dp"
        android:layout_height="100dp"/>