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Android：方向更改擦除對我的ImageView進行的修改

2011-04-05 28 views
2

我有我有ImageView的應用程序。我打開新的活動，我用手指畫了一些東西，這個位圖返回到我的ImageView。一切都很好，但是現在當我改變方向時，我用ImageView的活動重新繪製或重新啓動，並且imageview爲空。我嘗試了一切，我嘗試即時存檔和恢復狀態，嘗試configurationChange，等，但沒有什麼工作......Android：方向更改擦除對我的ImageView進行的修改

package jilova.Android.TextFolder; 

import java.io.ByteArrayOutputStream; 

import jilova.Android.Enums; 
import jilova.Android.R; 
import jilova.Android.DatabaseFolder.LocalDB; 
import jilova.Android.DatabaseFolder.RequestRow; 
import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.content.res.Configuration; 
import android.graphics.Bitmap; 
import android.graphics.Bitmap.Config; 
import android.graphics.BitmapFactory; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.os.Bundle; 
import android.view.Gravity; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.View.OnTouchListener; 
import android.widget.EditText; 
import android.widget.FrameLayout; 
import android.widget.ImageView; 
import android.widget.ScrollView; 
import android.widget.Toast; 

public class Text extends Activity{ 

    private static EditText t1; 
    private static EditText t2; 
    private static EditText t3; 
    private static EditText t4; 
    private static ImageView iv1; 
    private static Context c; 
    private static Activity ac; 


    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.text); 

     Object o = this.getLastNonConfigurationInstance(); 
     if(o!=null) 
     { 
      Enums.sign=(Bitmap)o; 
     } 

     c=this.getApplicationContext(); 
     ac=this; 

     ImageView iv = (ImageView)this.findViewById(R.id.imageView1); 
     iv.setDrawingCacheEnabled(true); 
     t1 = (EditText)this.findViewById(R.id.TEXTNote); 
     t2 = (EditText)this.findViewById(R.id.TextET2); 
     t3 = (EditText)this.findViewById(R.id.TextET3); 
     t4 = (EditText)this.findViewById(R.id.TextET4); 

     //iv.setImageBitmap(Bitmap.createScaledBitmap(Enums.sign, iv.getWidth(), iv.getHeight(), false).copy(Config.ARGB_8888, true)); 

    } 

    @Override 
    public void onConfigurationChanged(Configuration newConfig) { 
     super.onConfigurationChanged(newConfig); 

     // Checks the orientation of the screen 
     if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) { 

     } else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){ 

     } 
     // Checks whether a hardware keyboard is available 
     if (newConfig.hardKeyboardHidden == Configuration.HARDKEYBOARDHIDDEN_NO) { 

     } else if (newConfig.hardKeyboardHidden == Configuration.HARDKEYBOARDHIDDEN_YES) { 

     } 
    } 





    public static RequestRow getData() 
    { 
     RequestRow row = new RequestRow(); 
     row.SetREQUESTNOTE(t1.getText().toString()); 
     row.SetREQUESTTYPEID(Integer.parseInt(t2.getTag().toString())); 
     row.SetTYPTECHUDRZBYID(Integer.parseInt(t3.getTag().toString())); 
     row.SetOBJECTID(Integer.parseInt(t4.getTag().toString())); 
     return row; 
    } 

    public static void setData(String REQUESTTYPEID ,String TYPTECHUDRZBYID,String OBJECTID,String REQUESTNOTE,String REQUESTID) 
    { 
     t1.setText(REQUESTNOTE); 
     t2.setTag(REQUESTTYPEID); 
     t2.setText(LocalDB.dbGetRequestTypeByID(c, Integer.parseInt(REQUESTTYPEID))); 
     t3.setTag(TYPTECHUDRZBYID); 
     t3.setText(LocalDB.dbGetTypTechUdrzbyByID(c, Integer.parseInt(TYPTECHUDRZBYID))); 
     t4.setTag(OBJECTID); 
     t4.setText(LocalDB.dbGetObjectByID(c, Integer.parseInt(OBJECTID))); 
     Bitmap b = LocalDB.dbGetDocumentByID(c, Integer.parseInt(REQUESTID)); 
     if(b!=null) 
     { 
      iv1.setImageBitmap(b); 
     } 
    } 

    public static Bitmap getSign() 
    { 
     iv1.buildDrawingCache(); 
     Bitmap ret = iv1.getDrawingCache(); 

     if(Enums.EmptySignHash) 
     { 
      return null; 
     } 
     else 
     { 
      return ret; 
     } 
    } 

    public void Sign(View button) 
    { 
     Intent s = new Intent(Text.this,Sign.class); 
     startActivityForResult(s,Enums.SIGNREQUESTID); 
    } 

    protected void onActivityResult(int requestCode, int resultCode, Intent data) 
    { 
     if(resultCode!=Activity.RESULT_OK) 
     { 
      return; 
     } 
     Enums.IDLocal=-1; 
     if(requestCode==Enums.GetData) 
     { 
      Bundle extras = data.getExtras(); 
      if(extras !=null) 
      { 
       EditText et = (EditText)this.findViewById(extras.getInt("ViewID")); 
       et.setText(extras.getString("Value")); 
       et.setTag(extras.get("ID")); 
      } 
     } 
     else if(requestCode==Enums.SIGNREQUESTID) 
     { 
      Bundle extras = data.getExtras(); 
      if(extras !=null) 
      { 
       ImageView iv = (ImageView)this.findViewById(R.id.imageView1); 
       try 
       { 
        byte[] b = extras.getByteArray("Bitmap"); 
        Enums.sign = Bitmap.createBitmap(BitmapFactory.decodeByteArray(b, 0, b.length), 0, 0, ac.getWindowManager().getDefaultDisplay().getWidth(), 200); 
       iv.setImageBitmap(Bitmap.createScaledBitmap(Enums.sign, iv.getWidth(), iv.getHeight(), false)); 

       } 
       catch(Exception e) 
       { 
        int a=0; 
       } 
      } 
      Enums.EmptySignHash=false; 
     } 
    } 

    public static void DeleteAll() 
    { 
     EditText t = (EditText)ac.findViewById(R.id.TEXTNote); 
     t.setText(""); 
     t.setTag(-1); 
     t = (EditText)ac.findViewById(R.id.TextET2); 
     t.setText(""); 
     t.setTag(-1); 
     t = (EditText)ac.findViewById(R.id.TextET3); 
     t.setText(""); 
     t.setTag(-1); 
     t = (EditText)ac.findViewById(R.id.TextET4); 
     t.setText(""); 
     t.setTag(-1); 

     ImageView iv = (ImageView)ac.findViewById(R.id.imageView1); 
     //Bitmap b = Bitmap.createBitmap(Enums.createColors(), 0, Enums.STRIDE, Enums.WIDTH, Enums.HEIGHT, Bitmap.Config.ARGB_8888).copy(Bitmap.Config.ARGB_8888, true); 
     iv.setImageBitmap(Bitmap.createScaledBitmap(Enums.sign, ac.getWindowManager().getDefaultDisplay().getWidth(), iv.getLayoutParams().height, false)); 

     Enums.EmptySignHash=true; 
    } 

    public void Delete(View button) 
    { 
     EditText t = (EditText)this.findViewById(R.id.TEXTNote); 
     t.setText(""); 
     t.setTag(-1); 
     t = (EditText)this.findViewById(R.id.TextET2); 
     t.setText(""); 
     t.setTag(-1); 
     t = (EditText)this.findViewById(R.id.TextET3); 
     t.setText(""); 
     t.setTag(-1); 
     t = (EditText)this.findViewById(R.id.TextET4); 
     t.setText(""); 
     t.setTag(-1); 

     ImageView iv = (ImageView)this.findViewById(R.id.imageView1); 
     //Bitmap b = Bitmap.createBitmap(Enums.createColors(), 0, Enums.STRIDE, Enums.WIDTH, Enums.HEIGHT, Bitmap.Config.ARGB_8888).copy(Bitmap.Config.ARGB_8888, true); 
     iv.setImageBitmap(Bitmap.createScaledBitmap(Enums.sign, ac.getWindowManager().getDefaultDisplay().getWidth(), iv.getLayoutParams().height, false)); 

     Enums.EmptySignHash=true; 

    } 

    public void GetData(View button) 
    { 
     if(button.getId()==R.id.TextIB3) 
     { 
      Intent ChooseAction = new Intent(Text.this,ChooseData.class); 
      Enums.Data = LocalDB.dbLocalSelect(this.getApplicationContext(),"Select typtechudrzbyid,typtechudrzbydesc from typtechudrzby"); 
      if(Enums.Data==null) 
      { 
       Toast t=Toast.makeText(this, "Chyba lokalni db", Toast.LENGTH_SHORT); 
       t.setGravity(Gravity.CENTER, 0, 0); 
       t.show(); 
       return; 
      } 
      ChooseAction.putExtra("ViewID", R.id.TextET3); 
      startActivityForResult(ChooseAction,Enums.GetData); 
     } 
     else if(button.getId()==R.id.TextIB2) 
     { 
      Intent ChooseAction = new Intent(Text.this,ChooseData.class); 
      Enums.Data = LocalDB.dbLocalSelect(this.getApplicationContext(),"Select Requesttypeid,requestname from requesttype"); 
      if(Enums.Data==null) 
      { 
       Toast t=Toast.makeText(this, "Chyba lokalni db", Toast.LENGTH_SHORT); 
       t.setGravity(Gravity.CENTER, 0, 0); 
       t.show(); 
       return; 
      } 
      ChooseAction.putExtra("ViewID", R.id.TextET2); 
      startActivityForResult(ChooseAction,Enums.GetData); 
     } 
     else if(button.getId()==R.id.TextIB4) 
     { 
      Intent ChooseAction = new Intent(Text.this,TreeData.class); 
      Enums.TreeData = LocalDB.dbLocalSelectTree(this.getApplicationContext(),"Select objectid,objectname,objectref from Objects"); 
      if(Enums.TreeData==null) 
      { 
       Toast t=Toast.makeText(this, "Chyba lokalni db", Toast.LENGTH_SHORT); 
       t.setGravity(Gravity.CENTER, 0, 0); 
       t.show(); 
       return; 
      } 
      ChooseAction.putExtra("ViewID", R.id.TextET4); 
      startActivityForResult(ChooseAction,Enums.GetData); 
     } 
     else 
     { 
      //throw new Exception(); 
     }  

    } 
}

來源

2011-04-05 jerry2007

回答

1

我認爲你有這個link的解決方案。

https://stackoverflow.com/questions/456211/activity-restart-on-rotation-android

來源

2011-04-05 12:51:57 Jana

1

當配置變化，如由默認的活動被破壞並重新創建（當前活動的onDestroy被調用，那麼您的活動的一個新版本的onCreate被調用）出現屏幕旋轉。

您可以：

  • 停止的Android重新創建活動時的配置發生變化。爲此，請將android:configChanges="keyboardHidden|orientation"添加到清單中的活動標記。這是不推薦的，因爲如果你想要不同的佈局等不同的配置，你將不得不處理自己改變佈局。
  • 覆蓋onRetainNonConfigurationInstance並從中返回您的位圖。在onCreate檢查最後一個非配置實例是否爲空，在這種情況下將其轉換爲位圖，然後設置圖像。

對於後一種情況，使用類似以下內容：

@Override 
public void onCreate(Bundle savedInstanceState) { 
    ... 

    // Check if our activity was just destroyed and re-created 
    final Object retainedFromConfigChange = getLastNonConfigurationInstance(); 
    if (retainedFromConfigChange != null) { 
     // Activity has just been recreated, get the image we were working on 
     // before the configuration change 
     ImageView iv = (ImageView)ac.findViewById(R.id.imageView1); 
     iv.setImageBitmap((Bitmap) retainedFromConfigChange); 
    } 

    ... 
} 

@Override 
public Object getLastNonConfigurationInstance() { 
    ImageView iv = (ImageView)ac.findViewById(R.id.imageView1); 
    // We have to return a plain old Bitmap and not a drawable of any sorts 
    // or we will get memory leaks so we need to extract the bitmap from the drawable 
    return ((BitmapDrawable) iv.getDrawable()).getBitmap(); 
}

來源

2011-04-05 13:12:14

0

當配置改變時，整個視圖被重新創建。所以，我們需要保留imageView資源。這樣做的最好方法是通過創建保留片段來處理方向更改。

你可以在Android developer's page找到完美的文件。

P.S .:將android:configChanges="keyboardHidden|orientation"添加到清單是非常不推薦的。

來源

2017-05-16 10:17:46 backslashN

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