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Zoom Scroll View
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Anni1123 authored May 12, 2021
1 parent 08fac4a commit 9daffb7
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20 changes: 20 additions & 0 deletions ZoomScrollView/ZoomScrollView.iml
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<?xml version="1.0" encoding="UTF-8"?>
<module external.linked.project.id="ZoomScrollView" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" type="JAVA_MODULE" version="4">
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</module>
132 changes: 132 additions & 0 deletions ZoomScrollView/app/app.iml
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<?xml version="1.0" encoding="UTF-8"?>
<module external.linked.project.id=":app" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$/.." external.system.id="GRADLE" type="JAVA_MODULE" version="4">
<component name="FacetManager">
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<option name="LAST_KNOWN_AGP_VERSION" value="3.5.3" />
</configuration>
</facet>
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<configuration>
<option name="SELECTED_BUILD_VARIANT" value="debug" />
<option name="ASSEMBLE_TASK_NAME" value="assembleDebug" />
<option name="COMPILE_JAVA_TASK_NAME" value="compileDebugSources" />
<afterSyncTasks>
<task>generateDebugSources</task>
</afterSyncTasks>
<option name="ALLOW_USER_CONFIGURATION" value="false" />
<option name="MANIFEST_FILE_RELATIVE_PATH" value="/src/main/AndroidManifest.xml" />
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29 changes: 29 additions & 0 deletions ZoomScrollView/app/build.gradle
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apply plugin: 'com.android.application'

android {
compileSdkVersion 30
buildToolsVersion "30.0.3"
defaultConfig {
applicationId "com.anni.zoomscrollview"
minSdkVersion 19
targetSdkVersion 30
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
}

dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}
21 changes: 21 additions & 0 deletions ZoomScrollView/app/proguard-rules.pro
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# Add project specific ProGuard rules here.
# You can control the set of applied configuration files using the
# proguardFiles setting in build.gradle.
#
# For more details, see
# http://developer.android.com/guide/developing/tools/proguard.html

# If your project uses WebView with JS, uncomment the following
# and specify the fully qualified class name to the JavaScript interface
# class:
#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
# public *;
#}

# Uncomment this to preserve the line number information for
# debugging stack traces.
#-keepattributes SourceFile,LineNumberTable

# If you keep the line number information, uncomment this to
# hide the original source file name.
#-renamesourcefileattribute SourceFile
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package com.anni.zoomscrollview;

import android.content.Context;

import androidx.test.platform.app.InstrumentationRegistry;
import androidx.test.ext.junit.runners.AndroidJUnit4;

import org.junit.Test;
import org.junit.runner.RunWith;

import static org.junit.Assert.*;

/**
* Instrumented test, which will execute on an Android device.
*
* @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
*/
@RunWith(AndroidJUnit4.class)
public class ExampleInstrumentedTest {
@Test
public void useAppContext() {
// Context of the app under test.
Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();

assertEquals("com.anni.zoomscrollview", appContext.getPackageName());
}
}
21 changes: 21 additions & 0 deletions ZoomScrollView/app/src/main/AndroidManifest.xml
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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.anni.zoomscrollview">

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>
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package com.anni.zoomscrollview;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.animation.ScaleAnimation;
import android.widget.ScrollView;

public class MainActivity extends AppCompatActivity {

private static final String TAG = "MainActivity";
private float mScale = 1f;
private ScaleGestureDetector mScaleGestureDetector;
GestureDetector gestureDetector;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gestureDetector = new GestureDetector(this, new GestureListener());

mScaleGestureDetector = new ScaleGestureDetector(this, new ScaleGestureDetector.SimpleOnScaleGestureListener(){
@Override
public boolean onScale(ScaleGestureDetector detector) {
float scale = 1 - detector.getScaleFactor();
float prevScale = mScale;
mScale += scale;

if (mScale > 10f)
mScale = 10f;

ScaleAnimation scaleAnimation = new ScaleAnimation(1f / prevScale, 1f / mScale, 1f / prevScale, 1f / mScale, detector.getFocusX(), detector.getFocusY());
scaleAnimation.setDuration(0);
scaleAnimation.setFillAfter(true);
ScrollView layout = (ScrollView) findViewById(R.id.scrollView);
layout.startAnimation(scaleAnimation);
return true;
}
});

}

@Override
public boolean dispatchTouchEvent(MotionEvent event) {

super.dispatchTouchEvent(event);
mScaleGestureDetector.onTouchEvent(event);
gestureDetector.onTouchEvent(event);
return gestureDetector.onTouchEvent(event);
}

private class GestureListener extends GestureDetector.SimpleOnGestureListener{
@Override
public boolean onDown(MotionEvent e) {

return true;
}

@Override
public boolean onDoubleTap(MotionEvent e) {
return true;
}
}
}
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