ANDROID：通过单击按钮开始新活动
[英]ANDROID:starting new activities from button click
问题描述
I am new to android development so help me for : 
我是android开发的新手，所以请帮我：
I have an xml file with 7 buttons, named as: btn_1 btn_2, ... btn_7 我有一个带有7个按钮的xml文件，命名为：btn_1 btn_2，... btn_7
Here is the activity_main.xml 这是activity_main.xml
<Button
android:layout_width="103dp"
android:layout_height="82dp"
android:id="@+id/btn_1"
android:layout_below="@+id/heading1"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:background="@mipmap/pic1"
style="@style/Base.Widget.AppCompat.Button.Borderless"
android:clickable="true" />
AND here is the MainActivity.java - 这是MainActivity.java-
public class MainActivity extends AppCompatActivity {
private static Button btn1, btn2, btn3, btn4, btn5, btn6, btn7;
@
Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
OnClickButtonListener();
}
public void OnClickButtonListener() {
btn1 = (Button) findViewById(R.id.btn_1);
btn1.setOnClickListener(new View.OnClickListener() {@
Override
public void onClick(View v) {
Intent intent_1 = new Intent(MainActivity.this, MainActivity_1.class);
startActivity(intent_1);
}
});
btn2 = (Button) findViewById(R.id.btn_2);
btn2.setOnClickListener(new View.OnClickListener() {@
Override
public void onClick(View v) {
Intent intent_2 = new Intent(MainActivity.this, MainActivity_2.class);
startActivity(intent_2);
}
});
btn3 = (Button) findViewById(R.id.btn_3);
btn3.setOnClickListener(new View.OnClickListener() {@
Override
public void onClick(View v) {
Intent intent_3 = new Intent(MainActivity.this, MainActivity_3.class);
startActivity(intent_3);
}
});
btn4 = (Button) findViewById(R.id.btn_4);
btn4.setOnClickListener(new View.OnClickListener() {@
Override
public void onClick(View v) {
Intent intent_4 = new Intent(MainActivity.this, MainActivity_4.class);
startActivity(intent_4);
}
});
btn5 = (Button) findViewById(R.id.btn_5);
btn5.setOnClickListener(new View.OnClickListener() {@
Override
public void onClick(View v) {
Intent intent_5 = new Intent(MainActivity.this, MainActivity_5.class);
startActivity(intent_5);
}
});
btn6 = (Button) findViewById(R.id.btn_6);
btn6.setOnClickListener(new View.OnClickListener() {@
Override
public void onClick(View v) {
Intent intent_6 = new Intent(MainActivity.this, MainActivity_6.class);
startActivity(intent_6);
}
});
btn7 = (Button) findViewById(R.id.btn_7);
btn7.setOnClickListener(new View.OnClickListener() {@
Override
public void onClick(View v) {
Intent intent_7 = new Intent(MainActivity.this, MainActivity_7.class);
startActivity(intent_7);
}
});
}
}
When I click on the buttons, app crashes, but surprisingly NOT always. 当我单击按钮时，应用程序崩溃，但令人惊讶的是并非总是如此。 Also, in one attempt it crashes on clicking btn_6, then in the next attempt (when I reopen the app), it would crash on pressing a different button, say now button 5! 同样，在一次尝试中单击btn_6会使其崩溃，然后在下一次尝试（当我重新打开应用程序时）时，按下另一个按钮（现在说按钮5）会崩溃。
Now if i close the app, and try again, it may crash on pressing btn_3, while it would have worked perferctly fine in the previous attempt. 现在，如果我关闭该应用程序，然后重试，则按btn_3可能会崩溃，尽管在上一次尝试中本来可以正常工作。
Any insights? 有什么见解吗？ Thanks. 谢谢。
Here is the most recent logCat: 这是最新的logCat：
05-25 23:43:17.139 17042-17042 <XX> W/ <YY>: VFY: unable to resolve virtual method 134: Landroid/app/Activity;.onEnterAnimationComplete ()V
05-25 23:43:17.139 17042-17042 <XX> D/ <YY>: VFY: replacing opcode 0x6f at 0x140b
05-25 23:43:17.179 17042-17042 <XX> D/ <YY>: GC_FOR_ALLOC freed 345K, 3% free 54952K/56516K, paused 15ms, total 16ms
05-25 23:43:17.179 17042-17042 <XX> I/ <YY>-heap: Forcing collection of SoftReferences for 11040016-byte allocation
05-25 23:43:17.199 17042-17042 <XX> D/ <YY>: GC_BEFORE_OOM freed 3K, 3% free 54948K/56516K, paused 22ms, total 22ms
05-25 23:43:17.199 17042-17042 <XX> E/ <YY>-heap: Out of memory on a 11040016-byte allocation.
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>: "main" prio=5 tid=1 RUNNABLE
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>: | group="main" sCount=0 dsCount=0 obj=0x41e4f578 self=0x41e3a4e8
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>: | sysTid=17042 nice=-16 sched=0/0 cgrp=apps handle=1074368508
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>: | state=R schedstat=( 3391699451 331158977 2372 ) utm=269 stm=70 core=0
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>: at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>: at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:596)
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>: at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:444)
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>: at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:832)
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>: at android.content.res.Resources.loadDrawable(Resources.java:2988)
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>: at android.content.res.TypedArray.getDrawable(TypedArray.java:602)
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>: at android.view.View.<init>(View.java:3563)
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>: at android.widget.TextView.<init>(TextView.java:881)
05-25 23:43:17.199 17042-17042 <XX> I/ <YY>: at android.widget.Button.<init>(Button.java:108)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.support.v7.widget.AppCompatButton.<init>(AppCompatButton.java:62)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.support.v7.widget.AppCompatButton.<init>(AppCompatButton.java:58)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.support.v7.app.AppCompatViewInflater.createView(AppCompatViewInflater.java:105)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.support.v7.app.AppCompatDelegateImplV7.createView(AppCompatDelegateImplV7.java:972)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.support.v7.app.AppCompatDelegateImplV7.onCreateView(AppCompatDelegateImplV7.java:1030)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.support.v4.view.LayoutInflaterCompatHC$FactoryWrapperHC.onCreateView(LayoutInflaterCompatHC.java:44)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:690)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.view.LayoutInflater.rInflate(LayoutInflater.java:761)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.view.LayoutInflater.inflate(LayoutInflater.java:498)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.view.LayoutInflater.inflate(LayoutInflater.java:398)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.view.LayoutInflater.inflate(LayoutInflater.java:354)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:276)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:136)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at abcpqr.red.MainActivity_1.onCreate(MainActivity_1.java:21)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.app.Activity.performCreate(Activity.java:5372)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2257)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.app.ActivityThread.access$700(ActivityThread.java:159)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.os.Handler.dispatchMessage(Handler.java:99)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.os.Looper.loop(Looper.java:176)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at android.app.ActivityThread.main(ActivityThread.java:5419)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at java.lang.reflect.Method.invokeNative(Native Method)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at java.lang.reflect.Method.invoke(Method.java:525)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
05-25 23:43:17.204 17042-17042 <XX> I/ <YY>: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
05-25 23:43:17.209 17042-17042 <XX> I/ <YY>: at dalvik.system.NativeStart.main(Native Method)
05-25 23:43:17.209 17042-17042 <XX> D/skia: --- decoder->decode returned false
05-25 23:43:17.209 17042-17042 <XX> D/AndroidRuntime: Shutting down VM
05-25 23:43:17.209 17042-17042 <XX> W/ <YY>: threadid=1: thread exiting with uncaught exception (group=0x41e4e700)
05-25 23:43:17.209 17042-17042 <XX> E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.OutOfMemoryError
at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:596)
at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:444)
at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:832)
at android.content.res.Resources.loadDrawable(Resources.java:2988)
at android.content.res.TypedArray.getDrawable(TypedArray.java:602)
at android.view.View.<init>(View.java:3563)
at android.widget.TextView.<init>(TextView.java:881)
at android.widget.Button.<init>(Button.java:108)
at android.support.v7.widget.AppCompatButton.<init>(AppCompatButton.java:62)
at android.support.v7.widget.AppCompatButton.<init>(AppCompatButton.java:58)
at android.support.v7.app.AppCompatViewInflater.createView(AppCompatViewInflater.java:105)
at android.support.v7.app.AppCompatDelegateImplV7.createView(AppCompatDelegateImplV7.java:972)
at android.support.v7.app.AppCompatDelegateImplV7.onCreateView(AppCompatDelegateImplV7.java:1030)
at android.support.v4.view.LayoutInflaterCompatHC$FactoryWrapperHC.onCreateView(LayoutInflaterCompatHC.java:44)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:690)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:761)
at android.view.LayoutInflater.inflate(LayoutInflater.java:498)
at android.view.LayoutInflater.inflate(LayoutInflater.java:398)
at android.view.LayoutInflater.inflate(LayoutInflater.java:354)
at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:276)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:136)
at abcpqr.red.MainActivity_1.onCreate(MainActivity_1.java:21)
at android.app.Activity.performCreate(Activity.java:5372)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2257)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)
at android.app.ActivityThread.access$700(ActivityThread.java:159)
t android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:176)
at android.app.ActivityThread.main(ActivityThread.java:5419)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
at dalvik.system.NativeStart.main(Native Method)
05-25 23:43:25.074 17042-17042 <XX> I/Process: Sending signal. PID: 17042 SIG: 9
here is the gist of my xml: 这是我的xml的要点：
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:ads="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="xxx.MainActivity"> <Button android:layout_width="103dp" android:layout_height="82dp" android:id="@+id/btn_inside" android:layout_below="@+id/LL_subheading1" android:layout_centerHorizontal="true" android:background="@mipmap/pic_small_inside" style="@style/Widget.AppCompat.Button.Borderless" android:clickable="true"/> <Button android:layout_width="103dp" android:layout_height="82dp" android:id="@+id/btn_on_the_side1" android:layout_below="@+id/LL_subheading2" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:background="@mipmap/pic_small_on_the_side1" style="@style/Base.Widget.AppCompat.Button.Borderless" android:clickable="true"/> <Button android:layout_width="103dp" android:layout_height="82dp" android:id="@+id/btn_on_the_side3" android:layout_below="@+id/LL_subheading2" android:layout_alignParentRight="true" android:layout_alignParentEnd="true" android:background="@mipmap/pic_small_on_the_side3" style="@style/Base.Widget.AppCompat.Button.Borderless" android:clickable="true"/> <Button android:layout_width="103dp" android:layout_height="82dp" android:id="@+id/btn_on_the_side2" android:layout_alignTop="@+id/btn_on_the_side1" android:layout_centerHorizontal="true" android:background="@mipmap/pic_small_on_the_side2" style="@style/Base.Widget.AppCompat.Button.Borderless" android:clickable="true"/> <Button android:layout_width="103dp" android:layout_height="82dp" android:id="@+id/btn_outside1" android:layout_below="@+id/LL_subheading3" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:background="@mipmap/pic_small_outside1" style="@style/Base.Widget.AppCompat.Button.Borderless" android:clickable="true"/> <Button android:layout_width="103dp" android:layout_height="82dp" android:id="@+id/btn_outside2" android:layout_below="@+id/LL_subheading3" android:layout_centerHorizontal="true" android:background="@mipmap/pic_small_outside2" style="@style/Base.Widget.AppCompat.Button.Borderless" android:clickable="true"/> <Button android:layout_width="103dp" android:layout_height="82dp" android:id="@+id/btn_outside3" android:layout_below="@+id/LL_subheading3" android:layout_alignParentRight="true" android:layout_alignParentEnd="true" android:background="@mipmap/pic_small_outside3" style="@style/Base.Widget.AppCompat.Button.Borderless" android:clickable="true"/> </RelativeLayout>
5 个解决方案
解决方案1
0 2016-05-23 22:01:13
Please use the below code and check 请使用下面的代码并检查
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private Button btn1, btn2, btn3, btn4, btn5, btn6, btn7;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn1 = (Button) findViewById(R.id.btn_1);
btn2 = (Button) findViewById(R.id.btn_2);
btn3 = (Button) findViewById(R.id.btn_3);
btn4 = (Button) findViewById(R.id.btn_4);
btn5 = (Button) findViewById(R.id.btn_5);
btn6 = (Button) findViewById(R.id.btn_6);
btn7 = (Button) findViewById(R.id.btn_7);
btn1.setOnClickListener(this);
btn2.setOnClickListener(this);
btn3.setOnClickListener(this);
btn4.setOnClickListener(this);
btn5.setOnClickListener(this);
btn6.setOnClickListener(this);
btn7.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch(v.getId()) {
case R.id.btn_1:
Intent intent_1 = new Intent(MainActivity.this, MainActivity_1.class);
startActivity(intent_1);
break;
case R.id.btn_2:
Intent intent_2 = new Intent(MainActivity.this, MainActivity_2.class);
startActivity(intent_2);
break;
...
case R.id.btn_7:
Intent intent_7 = new Intent(MainActivity.this, MainActivity_7.class);
startActivity(intent_7);
break;
}
}
}
解决方案2
0 2016-05-23 22:04:13
First of all, let me give you some advice. 首先，让我给您一些建议。 Rearrange your code, to avoid wasting processing time on the creation of the screen (OnCreate method) on the following way: 重新安排代码，以免通过以下方式浪费屏幕创建时间（OnCreate方法）：
The design (xml) buttons should have the attribute onclick, like: 设计（xml）按钮应具有onclick属性，例如：
<Button android:id="@+id/button"
android:onClick="onClickButton"
android:text="Awesome" />
Then create a method for each button: 然后为每个按钮创建一个方法：
public void onClickButton(View v){
// Code to run after button click
}
This method needs to return void and have as argument a view. 此方法需要返回void并具有一个参数视图。
To help you with your error, I need the logcat that appears on the android monitor. 为了帮助您解决错误，我需要出现在android监视器上的logcat。 You just need to connect your phone to the pc and run the app from you developing environment. 您只需要将手机连接到PC并在开发环境中运行该应用即可。
解决方案3
0 2016-05-25 23:35:15
You use Big Images and the device runs out of memory. 您使用大图像，并且设备内存不足。 Please check your Images Size. 请检查您的图片大小。 And Share your Xml Layout please 并分享您的Xml布局
解决方案4
0 2016-05-26 00:44:13
You are getting an OutOfMemoryException . 您将收到OutOfMemoryException 。 See your 看到你的
logcatjava.lang.OutOfMemoryErroratandroid.graphics.BitmapFactory.android.graphics.BitmapFactory.logcatjava.lang.OutOfMemoryErrorandroid.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
The problem is you are creating New activities on your button click activities are heavy plus you are loading bitmaps in those activities from asset folder. 问题是您正在按钮上创建新活动，单击活动繁重，而且您正在从资产文件夹中将位图加载到这些活动中。 New activity instances with heavy Bitmaps in it is causing error. 带有大量位图的新活动实例导致错误。
Solution: replace activities with fragment and use Glide or Picasso to load Images. 解决方案：将活动替换为片段，然后使用Glide或Picasso加载图像。
Note: From now on if App crashes try to search for "Fatal" in your logcat, that log will have explanation of error. 注意：从现在开始，如果App崩溃，则尝试在logcat中搜索“致命”，该日志将包含错误说明。
解决方案5
0 2017-03-08 14:34:39
The errors you are getting are might be due to the 您收到的错误可能是由于
1.use of heavy sized images 1.使用大尺寸图像
2.you should always finish your previous activity to release some memory after moving from one activity to other. 2.从一个活动转移到另一个活动后，您应该始终完成上一个活动以释放一些内存。
3.Whenever you start to use more number of images in your app you should set android:largeHeap="true" in your Android Manifest file for application 3.每当您开始在应用中使用更多图片时，都应在Android清单文件中为应用设置android:largeHeap="true"
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