我想创建一个能够在所有API中运行的GridLayout.
问题是,当我使用GridLayout而不是android.support.v7.widget.GridLayout时,该应用程序在Android 7.1.1中正常运行,但在旧版本中它崩溃了.
但是,如果我使用android.support.v7.widget.GridLayout而不是GridLayout(如下面的代码),它总是崩溃.
activity_main
Logs
FATAL EXCEPTION: main
Process: devector.dom.gridtest, PID: 15773
java.lang.RuntimeException: Unable to start activity ComponentInfo{devector.dom.gridtest/devector.dom.gridtest.MainActivity}: java.lang.ClassCastException: android.support.v7.widget.GridLayout cannot be cast to android.widget.GridLayout
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2678)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2743)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1490)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6165)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:778)
Caused by: java.lang.ClassCastException: android.support.v7.widget.GridLayout cannot be cast to android.widget.GridLayout
at devector.dom.gridtest.MainActivity.onCreate(MainActivity.java:21)
at android.app.Activity.performCreate(Activity.java:6687)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1140)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2631)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2743)?
at android.app.ActivityThread.-wrap12(ActivityThread.java)?
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1490)?
at android.os.Handler.dispatchMessage(Handler.java:102)?
at android.os.Looper.loop(Looper.java:154)?
at android.app.ActivityThread.main(ActivityThread.java:6165)?
at java.lang.reflect.Method.invoke(Native Method)?
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888)?
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:778)?
Gradle
apply plugin: 'com.android.application'
android {
compileSdkVersion 26
defaultConfig {
applicationId "devector.dom.gridtest"
minSdkVersion 15
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:26.1.0'
implementation 'com.android.support:cardview-v7:26.1.0'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
implementation 'com.android.support:gridlayout-v7:26.1.0'
implementation 'com.android.support:design:26.1.0'
}
MainActivity.java
package devector.dom.gridtest;
import android.content.Intent;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.CardView;
import android.view.View;
import android.widget.GridLayout;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
GridLayout mainGrid;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mainGrid = (GridLayout) findViewById(R.id.mainGrid);
setSingleEvent(mainGrid);
}
private void setSingleEvent(GridLayout mainGrid) {
for (int i = 0; i