android 屏幕分辨率获取，等比缩放，屏幕横竖屏设置，屏幕截取

分辨率及密度获取：

DisplayMetrics dm = new DisplayMetrics(); 
dm = getResources().getDisplayMetrics(); 
int screenWidth = dm.widthPixels; 
int screenHeight = dm.heightPixels; 
float density = dm.density; 
float xdpi = dm.xdpi; 
float ydpi = dm.ydpi;

对于不同分辨率屏幕等比缩放方法：

private int getValues_x(int value_x)
	{
		return (int)((float)value_x/480*width);
	}
	
	private int getValues_y(int value_y)
	{
		return (int)((float)value_y/854*height);
	}

屏幕朝向设置：

//强制为横屏   
 setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);  
要设置成竖屏设置成 SCREEN_ORIENTATION_PORTRAIT

AndroidManifest.xml 中设置屏幕朝向
<activity android:name=".HandlerActivity" android:screenOrientation="landscape"/>
<activity android:name=".HandlerActivity" android:screenOrientation="portrait"/>

设置app在不同分辨率时，是否支持多密度的方法。
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
...
<supports-screens
android:smallScreens="true"
android:normalScreens="true"
android:largeScreens="true"
android:xlargeScreens="true"
android:anyDensity="true" />
</manifest>

dp与px转换的方法：

public static int dip2px(Context context, float dipValue){
　　final float scale = context.getResources().getDisplayMetrics().density;
　　return (int)(dipValue * scale +0.5f);
}


public static int px2dip(Context context, float pxValue){
　　final float scale = context.getResource().getDisplayMetrics().density;
　　return (int)(pxValue / scale +0.5f);
}

屏幕截取实现：

1，

/** 
         * 简易截屏方法 
         * @param v         视图 
         * @param filePath  保存路径 
         */  
        private void getScreenHot(View v, String filePath) {          
            try  
            {  
                Bitmap bitmap = Bitmap.createBitmap(v.getWidth(), v.getHeight(), Config.ARGB_8888);  
                Canvas canvas = new Canvas();  
                canvas.setBitmap(bitmap);  
                v.draw(canvas);  
      
                try{  
                    FileOutputStream fos = new FileOutputStream(filePath);  
                    bitmap.compress(CompressFormat.PNG, 90, fos);  
                }catch (FileNotFoundException e){  
                    Log.e("errormsg", e.toString());  
                    Toast.makeText(this, "找不到路径", 200).show();  
                }  
            }catch (Exception e){  
                Log.e("errormsg", e.toString());  
              Toast.makeText(this, "截图失败", 200).show();  
            }  
        }  

调用getScreenHot((View) getWindow().getDecorView(), "/sdcard/pic1.png"); 即可

2，

/** 
 * 获取和保存当前屏幕的截图 
 */  
private void SaveCurrentImage()    
{    
    //创建Bitmap    
    WindowManager windowManager = getWindowManager();    
    Display display = windowManager.getDefaultDisplay();    
    int w = display.getWidth();    
    int h = display.getHeight();    
        
    Bitmap bmp = Bitmap.createBitmap( w, h, Config.ARGB_8888 );        
        
    //获取屏幕    
    View decorview = this.getWindow().getDecorView();     
    decorview.setDrawingCacheEnabled(true);     
    bmp = decorview.getDrawingCache();     
      
    String SavePath = getSDCardPath()+"/ScreenImage";  
    
    //存储为Bitmap     
    try {    
        SimpleDateFormat sdf = new SimpleDateFormat(  
                "yyyy-MM-dd_HH-mm-ss", Locale.CHINA);  
              
        File path = new File(SavePath);    
        //文件    
        String filepath = SavePath + "/"+sdf.format(new Date()) + ".png";    
        File file = new File(filepath);    
        if(!path.exists()){    
            path.mkdirs();    
        }    
        if (!file.exists()) {    
            file.createNewFile();    
        }    
            
        FileOutputStream fos = null;    
        fos = new FileOutputStream(file);    
        if (null != fos) {    
            bmp.compress(Bitmap.CompressFormat.PNG, 100, fos);    
            fos.flush();    
            fos.close();      
                
            Toast.makeText(this, "截屏文件已保存至SDCard/ScreenImage/下", Toast.LENGTH_LONG).show();    
        }    
    
    } catch (Exception e) {    
        e.printStackTrace();    
    }    
}