Android触控
转载请标明出处：http://blog.csdn.net/wu_wxc/article/details/51179151
本文出自【吴孝城的CSDN博客】
Android点击触控事件
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/fl"
tools:context="cn.wuxiaocheng.multitouch.MainActivity">
<ImageView
android:id="@+id/img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@mipmap/ic_launcher" />
</FrameLayout>
MainActivity.java
package cn.wuxiaocheng.multitouch;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ImageView;
public class MainActivity extends AppCompatActivity {
private FrameLayout root;
private ImageView img;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
root = (FrameLayout) findViewById(R.id.fl);
img = (ImageView) findViewById(R.id.img);
root.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
switch (motionEvent.getAction()){
case MotionEvent.ACTION_DOWN:
Log.d("MotionEvent", "按下");
break;
case MotionEvent.ACTION_MOVE:
Log.d("MotionEvent", "移动");
FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) img.getLayoutParams();
lp.leftMargin = (int) motionEvent.getX();
lp.topMargin = (int) motionEvent.getY();
img.setLayoutParams(lp);
break;
case MotionEvent.ACTION_UP:
Log.d("MotionEvent", "松开");
break;
}
//要返回true，不然
return true;
}
});
}
}
放大缩小
package cn.wuxiaocheng.multitouch;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.FrameLayout;
public class MainActivity extends AppCompatActivity {
private FrameLayout root;
private float currentDistance;//当前距离
private float lastDistance = -1;//最终距离
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
root = (FrameLayout) findViewById(R.id.fl);
root.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
switch (motionEvent.getAction()) {
case MotionEvent.ACTION_DOWN:
System.out.println("ffffffffffffff");
break;
case MotionEvent.ACTION_MOVE:
Log.d("MotionEvent", "移动");
//当至少有两个触摸点时
if (motionEvent.getPointerCount() >= 2) {
float offSetX = motionEvent.getX(0) - motionEvent.getX(1);
float offSetY = motionEvent.getY(0) - motionEvent.getY(1);
//先算X轴的平方，再算Y轴的平方，然后开平方，得到两点的距离
currentDistance = (float) Math.sqrt(offSetX * offSetX + offSetY * offSetY);
if (lastDistance < 0) {
lastDistance = currentDistance;
} else {
//放大或缩小的像素大于5个像素时
if (currentDistance - lastDistance > 5) {
Log.d("触摸", "放大");
lastDistance = currentDistance;
} else if (lastDistance - currentDistance > 5) {
Log.d("触摸", "缩小");
lastDistance = currentDistance;
}
}
}
break;
case MotionEvent.ACTION_UP:
Log.d("MotionEvent", "松开");
break;
}
//要返回true，不然
return true;
}
});
}
}
图片放大缩小
package cn.wuxiaocheng.multitouch;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ImageView;
public class MainActivity extends AppCompatActivity {
private FrameLayout root;
private ImageView img;
private float currentDistance;//当前距离
private float lastDistance = -1;//最终距离
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
root = (FrameLayout) findViewById(R.id.fl);
img = (ImageView) findViewById(R.id.img);
root.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
switch (motionEvent.getAction()) {
case MotionEvent.ACTION_DOWN:
System.out.println("ffffffffffffff");
break;
case MotionEvent.ACTION_MOVE:
Log.d("MotionEvent", "移动");
//当至少有两个触摸点时
if (motionEvent.getPointerCount() >= 2) {
float offSetX = motionEvent.getX(0) - motionEvent.getX(1);
float offSetY = motionEvent.getY(0) - motionEvent.getY(1);
//先算X轴的平方，再算Y轴的平方，然后开平方，得到两点的距离
currentDistance = (float) Math.sqrt(offSetX * offSetX + offSetY * offSetY);
if (lastDistance < 0) {
lastDistance = currentDistance;
} else {
//放大或缩小的像素大于5个像素时
if (currentDistance - lastDistance > 5) {
FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) img.getLayoutParams();
lp.width = (int) (1.1 * img.getWidth());
lp.height = (int) (1.1 * img.getHeight());
img.setLayoutParams(lp);
lastDistance = currentDistance;
} else if (lastDistance - currentDistance > 5) {
FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) img.getLayoutParams();
lp.width = (int) (0.9 * img.getWidth());
lp.height = (int) (0.9 * img.getHeight());
img.setLayoutParams(lp);
lastDistance = currentDistance;
}
}
}
break;
case MotionEvent.ACTION_UP:
Log.d("MotionEvent", "松开");
break;
}
//要返回true，不然
return true;
}
});
}
}
