android内存溢出！！求具体的解决办法

Question

package micr3.login;import java.io.IOException;import android.app.Activity;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.net.Uri;
import android.os.Bundle;
import android.os.ParcelFileDescriptor;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;public class Logining1Activity extends Activity {
    /** Called when the activity is first created. */
EditText username;
EditText password;
CheckBox p1,p2,p3,p4;
Button logining;
String name;
String pasd;
@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
         username=(EditText)findViewById(R.id.autocomplete);
          password=(EditText)findViewById(R.id.password);
          p1=(CheckBox)findViewById(R.id.plain_cb1);
          p2=(CheckBox)findViewById(R.id.plain_cb2);
          p3=(CheckBox)findViewById(R.id.plain_cb3);
          p4=(CheckBox)findViewById(R.id.plain_cb4);
          logining=(Button)findViewById(R.id.logining);
    
          p1.setOnClickListener(new OnClickListener() {

public void onClick(View v) {
// TODO Auto-generated method stub
  name = username.getText().toString();
                   pasd = password.getText().toString();
                  SharedPreferences sp = getSharedPreferences("preferences",                          Context.MODE_PRIVATE);
                  Editor editor = sp.edit();                  editor.putString("name", name);                  editor.putString("password", pasd);
                  if (editor.commit())                      Toast.makeText(Logining1Activity.this,                                        R.string.save_success, 1).show();            else
                      Toast.makeText(Logining1Activity.this,
                            R.string.save_failed, 1).show();
}
});
          logining.setOnClickListener(new OnClickListener() {

public void onClick(View v) {
// TODO Auto-generated method stub

String name1 = username.getText().toString();
String pasd1 = password.getText().toString();
               if(name1=="qq"||pasd1=="qq"){
                Intent intent=new Intent();
                intent.setClass(Logining1Activity.this, Mainface.class);
                startActivity(intent);
               Logining1Activity.this.finish();
                
               }
               else{
                Toast.makeText(Logining1Activity.this,
                           R.string.wrong, 1).show();
              
               }

}
});
          
 
          
          
    }
    
}在如上的Activity中我该怎样使用Bitmap方法，或者还有更好的办法 求各位帮忙，同时标明注释 谢谢！！！！

Answer 1

Bitmap的使用是尽量使用小图，尽量做到不使用的时候就回收
这里有篇文章介绍关于避免OOM错误
http://ttlnews.blogspot.com/2010/01/attacking-memory-problems-on-android.html

Answer 2

● 主要是加上这段： 
BitmapFactory.Options options = new BitmapFactory.Options(); 
                options.inSampleSize = 2; ● eg1：(通过Uri取图片) 
private ImageView preview; 
BitmapFactory.Options options = new BitmapFactory.Options(); 
                    options.inSampleSize = 2;//图片宽高都为原来的二分之一，即图片为原来的四分之一 
                    Bitmap bitmap = BitmapFactory.decodeStream(cr 
                            .openInputStream(uri), null, options); 
                    preview.setImageBitmap(bitmap); 
以上代码可以优化内存溢出，但它只是改变图片大小，并不能彻底解决内存溢出。 
● eg2:（通过路径去图片） 
private ImageView preview; 
private String fileName= "/sdcard/DCIM/Camera/2010-05-14 16.01.44.jpg"; 
BitmapFactory.Options options = new BitmapFactory.Options(); 
                options.inSampleSize = 2;//图片宽高都为原来的二分之一，即图片为原来的四分之一 
                        Bitmap b = BitmapFactory.decodeFile(fileName, options); 
                        preview.setImageBitmap(b); 
                        filePath.setText(fileName); 
http://ming-fanglin.iteye.com/blog/1132564

Answer 3

package micr3.login;import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;
import dalvik.system.VMRuntime;public class Logining1Activity extends Activity {
    /** Called when the activity is first created. */
EditText username;
EditText password;
CheckBox p1,p2,p3,p4;
Button logining;
String name;
String pasd; private final static float TARGET_HEAP_UTILIZATION = 0.75f;
@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        VMRuntime.getRuntime().setTargetHeapUtilization(TARGET_HEAP_UTILIZATION); 
         username=(EditText)findViewById(R.id.autocomplete);
          password=(EditText)findViewById(R.id.password);
          p1=(CheckBox)findViewById(R.id.plain_cb1);
          p2=(CheckBox)findViewById(R.id.plain_cb2);
          p3=(CheckBox)findViewById(R.id.plain_cb3);
          p4=(CheckBox)findViewById(R.id.plain_cb4);
          logining=(Button)findViewById(R.id.logining);
    
          p1.setOnClickListener(new OnClickListener() {

public void onClick(View v) {
// TODO Auto-generated method stub
  name = username.getText().toString();
                   pasd = password.getText().toString();
                  SharedPreferences sp = getSharedPreferences("preferences",                          Context.MODE_PRIVATE);
                  Editor editor = sp.edit();                  editor.putString("name", name);                  editor.putString("password", pasd);
                  if (editor.commit())                      Toast.makeText(Logining1Activity.this,                                        R.string.save_success, 1).show();            else
                      Toast.makeText(Logining1Activity.this,
                            R.string.save_failed, 1).show();
}
});
          logining.setOnClickListener(new OnClickListener() {

public void onClick(View v) {
// TODO Auto-generated method stub

String name1 = username.getText().toString();
String pasd1 = password.getText().toString();
               if(name1=="qq"||pasd1=="qq"){
                Intent intent=new Intent();
                intent.setClass(Logining1Activity.this, Mainface.class);
                startActivity(intent);
               Logining1Activity.this.finish();
                
               }
               else{
                Toast.makeText(Logining1Activity.this,
                           R.string.wrong, 1).show();
              
               }

}
});
          
          
          
          
          
          
          
          
          
          
          
          
          
    }
    
}对不？？

Answer 4

 VMRuntime.getRuntime().setTargetHeapUtilization(TARGET_HEAP_UTILIZATION); 
能解决问题吗，
求结果

Answer 5

在你认为图片资源已经作废后的情况下，请调用强制资源回收。
system.gc()
当然，这意味着你要很清楚你的资利用情况。在这在我的开发项目中有效的解决了问题。

Answer 6

system.gc()是收回全部的，还是什么