Android Imageview图片旋转和大小变化
16lz
2021-01-23
Android Imageview图片旋转和大小变化
先看效果图:
直接上代码吧
activity.java
import androidx.annotation.NonNull;import androidx.appcompat.app.AppCompatActivity;import android.graphics.Bitmap;import android.graphics.Matrix;import android.graphics.drawable.BitmapDrawable;import android.media.Image;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.DisplayMetrics;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.SeekBar;import android.widget.TextView;public class MainActivity extends AppCompatActivity implements SeekBar.OnSeekBarChangeListener { private ImageView iv_route_image; private TextView tv_size; private TextView tv_route; private SeekBar sb_change_size; private SeekBar sb_change_route; private int minWidth = 300; private int routeAngle; private Matrix matrix = new Matrix(); private static final int ROUTE_IMAGE_MSG = 1; /** * 使用handle似乎旋转更流畅点(博主希望你们有更好的建议,是旋转更流畅,欢迎评论) */ private Handler handler = new Handler(){ @Override public void handleMessage(@NonNull Message msg) { super.handleMessage(msg); switch (msg.what){ case ROUTE_IMAGE_MSG: { tv_route.setText("角度: "+routeAngle); //先获取目标图片的参数信息 Bitmap bitmap = ((BitmapDrawable)(getResources().getDrawable(R.drawable.back))).getBitmap(); matrix.setRotate(routeAngle);//设置反转角度 bitmap = Bitmap.createBitmap(bitmap,0,0,bitmap.getWidth(),bitmap.getHeight(),matrix,true); iv_route_image.setImageBitmap(bitmap); } break; default: break; } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); initData(); } private void initData() { //获取屏幕参数 DisplayMetrics displayMetrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(displayMetrics); sb_change_size.setMax(displayMetrics.widthPixels-minWidth);//屏幕宽度-最小值 } private void initView() { iv_route_image = findViewById(R.id.iv_route_image); tv_size= findViewById(R.id.tv_size); tv_route= findViewById(R.id.tv_route); sb_change_size= findViewById(R.id.sb_change_size); sb_change_size.setOnSeekBarChangeListener(this); sb_change_route= findViewById(R.id.sb_change_route); sb_change_route.setOnSeekBarChangeListener(this); } @Override public void onProgressChanged(SeekBar seekBar, int i, boolean b) { switch (seekBar.getId()){ case R.id.sb_change_size: { tv_size.setText("大小: "+i); int newWidth = i+minWidth; int newHeight = (int)newWidth*3/4;//根据image view的大小就是一个3/4的比例,同时新的大小也应该满足 iv_route_image.setLayoutParams(new LinearLayout.LayoutParams(newWidth,newHeight));//设置image view布局大小 } break; case R.id.sb_change_route: { routeAngle = i; Message msg = new Message(); msg.what = ROUTE_IMAGE_MSG; handler.sendMessage(msg); } break; default: break; } } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onStopTrackingTouch(SeekBar seekBar) { }}布局文件
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