实现在ScrollView中拖动控件与按图片比例动态控制布局大小

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以下贴出源代码

主文件：

package com.example.test3;import java.io.IOException;import java.io.InputStream;import com.example.test3.MainActivity;import com.example.test3.R;import android.support.v7.app.ActionBarActivity;import android.annotation.SuppressLint;import android.app.ActionBar.LayoutParams;import android.content.ContentResolver;import android.content.Context;import android.content.Intent;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;import android.database.Cursor;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.net.Uri;import android.os.Bundle;import android.provider.MediaStore;import android.util.Log;import android.view.Menu;import android.view.MenuItem;import android.view.MotionEvent;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.RelativeLayout;import android.widget.ScrollView;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends ActionBarActivity {double HW;double screenHeight;double screenWidth;TextView tv1;SharedPreferences sp;final String IMAGE_TYPE = "image/*";    final int IMAGE_CODE = 0;   //这里的IMAGE_CODE是自己任意定义的@Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                Button addPic=(Button) findViewById(R.id.button1);        addPic.setOnClickListener(listener);                        screenHeight = this.getWindowManager().getDefaultDisplay().getHeight();screenWidth = this.getWindowManager().getDefaultDisplay().getWidth();//增加可拖动控件 tv1 = ( TextView ) findViewById(R.id.textView11);    MoveWidget(tv1);    }private OnClickListener listener=new OnClickListener(){    @Override    public void onClick(View v) {        // TODO Auto-generated method stub                        Button btn=(Button) v;                switch(btn.getId()){                case R.id.button1:            setImage();            break;        }            }        private void setImage() {        // TODO Auto-generated method stub        //使用intent调用系统提供的相册功能，使用startActivityForResult是为了获取用户选择的图片        Intent getAlbum = new Intent(Intent.ACTION_GET_CONTENT);        getAlbum.setType(IMAGE_TYPE);        startActivityForResult(getAlbum, IMAGE_CODE);                    }};     @SuppressLint("NewApi") protected void onActivityResult(int requestCode, int resultCode, Intent data){            if (resultCode != RESULT_OK) {        //此处的 RESULT_OK 是系统自定义得一个常量                Log.e("TAG->onresult","ActivityResult resultCode error");                return;            }                    Bitmap bm = null;                    //外界的程序访问ContentProvider所提供数据 可以通过ContentResolver接口            ContentResolver resolver = getContentResolver();                        //此处的用于判断接收的Activity是不是你想要的那个            if (requestCode == IMAGE_CODE) {                try {                    Uri originalUri = data.getData();        //获得图片的uri                            bm = MediaStore.Images.Media.getBitmap(resolver, originalUri);//                  这里开始的第二部分，获取图片的路径：                                        String[] proj = {MediaStore.Images.Media.DATA};                            //好像是android多媒体数据库的封装接口，具体的看Android文档                    Cursor cursor = managedQuery(originalUri, proj, null, null, null);                    //按我个人理解 这个是获得用户选择的图片的索引值                    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);                    //将光标移至开头 ，这个很重要，不小心很容易引起越界                    cursor.moveToFirst();                    //最后根据索引值获取图片路径                    String path = cursor.getString(column_index);            //设置各个布局大小适应手机屏幕                                      HW=(1f*bm.getHeight())/(1f*bm.getWidth());    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(    (int) (this.screenWidth* 1f + 0.5f),    //这里用宽去乘HW得到的不知道为什么是错误数值，对JAVA浮点运算不了解                    (int) (this.screenWidth*HW * 1f + 0.5f));    LinearLayout ll=(LinearLayout)findViewById(R.id.LinearLayout1);    ll.setLayoutParams(params);    //这里有BUG，华为机子用setBackground代替setBackgroundDrawable直接掉线    ll.setBackgroundDrawable(Drawable.createFromPath(path));//    Toast.makeText(this, ""+bm.getWidth()+bm.getHeight()+HW, Toast.LENGTH_LONG).show();                                   }catch (IOException e) {                    Log.e("TAG-->Error",e.toString());                }            }                 }                         //移动控件函数     void MoveWidget(final TextView tv){ sp = getSharedPreferences( "config" , Context.MODE_PRIVATE );  int lastx = sp.getInt( "lastx" , 0 ); int lasty = sp.getInt( "lasty" , 0 );  tv.setOnTouchListener( new View.OnTouchListener(){ intstartX; intstartY; @Override public boolean onTouch( View v, MotionEvent event ) { MyScrollView sv=(MyScrollView) findViewById(R.id.scrollView1); switch ( event.getAction() ) { case MotionEvent.ACTION_DOWN: sv.requestDisallowInterceptTouchEvent(true);   this.startX = ( int ) event.getRawX(); this.startY = ( int ) event.getRawY(); break; case MotionEvent.ACTION_MOVE: sv.requestDisallowInterceptTouchEvent(true);   int newX = ( int ) event.getRawX(); int newY = ( int ) event.getRawY(); int dx = newX - this.startX; int dy = newY - this.startY;  int l = tv.getLeft(); int r = tv.getRight(); int t = tv.getTop(); int b = tv.getBottom(); int newt = t + dy; int newb = b + dy; int newl = l + dx; int newr = r + dx; if ( ( newl < 0 ) || ( newt < 0 ) || ( newr > screenWidth ) || ( newb > screenHeight ) ) { break; }  tv.layout( newl , newt , newr , newb ); this.startX = ( int ) event.getRawX(); this.startY = ( int ) event.getRawY(); break; case MotionEvent.ACTION_UP: int lastx = tv.getLeft(); int lasty = tv.getTop(); Editor editor = sp.edit(); editor.putInt( "lastx" , lastx ); editor.putInt( "lasty" , lasty ); editor.commit(); break; case MotionEvent.ACTION_CANCEL:  sv.requestDisallowInterceptTouchEvent(true);   } return true; } } ); }                @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        // Handle action bar item clicks here. The action bar will        // automatically handle clicks on the Home/Up button, so long        // as you specify a parent activity in AndroidManifest.xml.        int id = item.getItemId();        if (id == R.id.action_settings) {            return true;        }        return super.onOptionsItemSelected(item);    }}

自己重写的ScrollView（便于之后扩展功能）：

package com.example.test3;import android.content.Context;import android.util.AttributeSet;import android.view.MotionEvent;import android.widget.ScrollView;//重写ScrollView方法public class MyScrollView extends ScrollView{public MyScrollView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);}public MyScrollView(Context context, AttributeSet attrs) {super(context, attrs);}public MyScrollView(Context context) {super(context);}}

最后是XML布局文件：

 <com.example.test3.MyScrollView xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"        android:id="@+id/scrollView1"        android:layout_width="match_parent"        android:layout_height="match_parent"    tools:context="com.example.test3.MainActivity" >        <LinearLayout            android:layout_width="match_parent"            android:layout_height="0dp"            android:orientation="vertical" >            <LinearLayout                android:id="@+id/LinearLayout1"                android:layout_width="match_parent"                android:layout_height="match_parent"                android:background="@drawable/personphoto"                android:orientation="vertical" >                <TextView                    android:id="@+id/textView11"                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:text="TextView"                    android:textSize="25dp" />            </LinearLayout>            <Button                android:id="@+id/button1"                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:text="Button" />            <TextView                android:id="@+id/TextView01"                android:layout_width="fill_parent"                android:layout_height="50px"                android:gravity="center"                android:text="This is textView." >            </TextView>        </LinearLayout>    </com.example.test3.MyScrollView>

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