Question

我使用webview从sdcard加载图像它工作正常但是当我点击一个按钮将webview转换为180度时，webview就会消失，但是当我再次按下它时，webview就可见了。我尝试在运行时以prgrammatically方式更改layout_width和height，但它不起作用。

MY Xml：

<nidhinkumar.pencilruler.helper.MywebView
    android:id="@+id/full_image_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_alignParentTop="true"

    />

代码：

public class TeacherViewImage extends Activity{
TextView text,imagename,imagecount,done;
ImageButton btnback,rotate,landrotate;
Button draw,zoom,undo,redo,clear,rotatez;
float initialScale;
int position;
String[] filepath;
String[] filename;
MywebView wx;
Bitmap b;
FrameLayout frame;
ProgressDialog pg;
int count=0;
ImageView img;
int width,height;
float angle=0;
final Context context=this;
LayoutAnimationController animController;
@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    wx.saveState(outState);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState)
{
    super.onRestoreInstanceState(savedInstanceState);

    // Restore the state of the WebView
    wx.restoreState(savedInstanceState);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.teacherview_newimage);
    Intent i = getIntent();
    // Get the position
    position = i.getExtras().getInt("position");
    // Get String arrays FilePathStrings
    filepath = i.getStringArrayExtra("filepath");
    // Get String arrays FileNameStrings
    filename = i.getStringArrayExtra("filename");
    count=position+1;
    // Locate the TextView in view_image.xml
    text = (TextView) findViewById(R.id.imagetext);
    // Load the text into the TextView followed by the position
    text.setText(filename[position]);
    // Locate the ImageView in view_image.xml
    img=new ImageView(this);
    imagecount=(TextView)findViewById(R.id.sheetevalimagename);
    imagecount.setText("Page"+count);
    draw=(Button)findViewById(R.id.teacherbtndraw);
    zoom=(Button)findViewById(R.id.teacherbtnzoom);
    clear=(Button)findViewById(R.id.teacherbtnclear);
    undo=(Button)findViewById(R.id.teacherbtnundo);
    redo=(Button)findViewById(R.id.teacherbtnredo);
    rotatez=(Button)findViewById(R.id.teacherbtnorientation);
    done=(TextView)findViewById(R.id.teacherbtndone);
    frame=(FrameLayout)findViewById(R.id.frmlayout);
    Display display = ((WindowManager) getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
    DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
    width = displayMetrics.widthPixels;
    height = displayMetrics.heightPixels;
    btnback=(ImageButton)findViewById(R.id.teacherviewimageback);
    btnback.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i=new Intent(TeacherViewImage.this,TeacherCorrectMainActivity.class);
            i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK|Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivity(i);
        }
    });



    //imageview = (ImageView) findViewById(R.id.full_image_view);
    pg=new ProgressDialog(TeacherViewImage.this);
    //rotate=(Button)findViewById(R.id.rotate);
    wx = (MywebView) findViewById(R.id.full_image_view);
    wx.setBackgroundColor(0);
    //wx.getSettings().setBuiltInZoomControls(true);
      wx.getSettings().setUseWideViewPort(true);
    //wx.setDrawingCacheEnabled(true);

    WebSettings webSettings = wx.getSettings();
    //wx.getSettings().setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN);
    if (savedInstanceState == null)
    {
        wx.loadUrl("file:///" + filepath[position]);
    }
    wx.loadUrl("file:///" + filepath[position]);
    //wx.setDrawingCacheEnabled(false);
    // picView.setOnClickListener();
    //wx.setInitialScale(68);
    wx.getSettings().setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN);
    wx.setDrawingCacheEnabled(true);
    wx.getSettings().setSupportZoom(true);
    wx.getSettings().setBuiltInZoomControls(true);
    wx.getSettings().setDisplayZoomControls(false);
    wx.setPadding(0, 0, 0, 0);
    wx.getSettings().setLoadWithOverviewMode(true);

    //wx.getSettings().setUseWideViewPort(true);
    wx.setWebViewClient(new WebViewClient()
    {
        @Override
        public void onPageFinished(WebView view, String url)
        {
            TeacherViewImage.this.initialScale = wx.getScale();

        }
    });

    rotatez.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            imagecount.setText("Rotation-Enabled");
            v.setSelected(!v.isSelected());
          //  wx.allowzooming=false;
          //  wx.allowdrawing=false;
        //    wx.onRotate();

            angle+=180;
            if(angle==180){
                ViewGroup.LayoutParams vc=wx.getLayoutParams();
                vc.height=width;
                vc.width=height;

                wx.setLayoutParams(vc);


            }

            wx.setRotation(angle);

          //  wx.setLayoutAnimation(animController);
        }
    });

    draw.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            imagecount.setText("Draw ");
            v.setSelected(!v.isSelected());
            wx.allowzooming=false;
            // wx.allowdrawing=true;
            wx.allowdrawing=v.isSelected();
            wx.getSettings().setSupportZoom(false);
            wx.getSettings().setBuiltInZoomControls(false);
            wx.getSettings().setDisplayZoomControls(false);
        }
    });
    zoom.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            imagecount.setText("Zoom Enabled");
            v.setSelected(!v.isSelected());
            wx.allowdrawing=false;
            wx.allowzooming=v.isSelected();
            wx.getSettings().setSupportZoom(true);
            wx.getSettings().setBuiltInZoomControls(true);
            wx.getSettings().setDisplayZoomControls(false);
            wx.getSettings().setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN);
            wx.setDrawingCacheEnabled(true);

        }
    });
    undo.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            imagecount.setText("Undo");
            wx.onClickUndo();
        }
    });
    redo.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            imagecount.setText("Redo");
            wx.onClickRedo();
        }
    });
    clear.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            imagecount.setText("Page"+count);
            wx.reset();

        }
    });
    done.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            showInputDialog();
        }
    });

}

Answer 1

尝试在onCreate()：

中将此段代码设置为webView

wx.setLayerType(View.LAYER_TYPE_SOFTWARE, null);

如果您愿意，可以将其设置为xml文件，如下所示：

<nidhinkumar.pencilruler.helper.MywebView
    android:id="@+id/full_image_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_alignParentTop="true"
    android:layerType="software"
    />

当它旋转到180度时无法在android中查看webview

1 个答案: