前言
最近又开始捣鼓APP，许多api , class都忘记怎么用了，楼下使用AlertDialog实现个弹出菜单，结果直接crash，查了半天，终于即将，记录一下……
1 实现代码
AlertDialog.Builder mBuilder = new AlertDialog.Builder(mContext);//will be crash: android.content.res.Resources$NotFoundException: Resource ID #0x0
mBuilder = new AlertDialog.Builder(this);
//填充列表数据
final String[] items = new String[]{"选项1", "选项2", "选项3"};
mBuilder.setTitle("选择一项"); // 设置标题
mBuilder.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(mContext, "clicked:"+ items[which], Toast.LENGTH_SHORT).show();
}
});
mBtnApp6.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// 创建并显示对话框
mBuilder.create().show();//界面上mBtnApp6按钮点击后执行dialog显示
}
});
2 实现效果
3 增加数据项的效果
4 遇到的错误
- android.content.res.Resources$NotFoundException: Resource ID #0x0
- 原因：new AlertDialog.Builder(mContext) ， crash
或 new AlertDialog.Builder(getApplicationContext()） , crash
- 解决办法：new AlertDialog.Builder(this), OK
--------- beginning of crash 04-18 17:08:40.940 6011 6011 E AndroidRuntime: FATAL EXCEPTION: main 04-18 17:08:40.940 6011 6011 E AndroidRuntime: Process: com.cictech.xlauncher, PID: 6011 04-18 17:08:40.940 6011 6011 E AndroidRuntime: android.content.res.Resources$NotFoundException: Resource ID #0x0 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.content.res.ResourcesImpl.getValue(ResourcesImpl.java:237) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.content.res.Resources.loadXmlResourceParser(Resources.java:2400) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.content.res.Resources.getLayout(Resources.java:1252) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:530) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:479) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at androidx.appcompat.app.AlertController$AlertParams.createListView(AlertController.java:989) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at androidx.appcompat.app.AlertController$AlertParams.apply(AlertController.java:965) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at androidx.appcompat.app.AlertDialog$Builder.create(AlertDialog.java:984) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at com.cictech.xlauncher.MainActivity$7.onClick(MainActivity.java:188) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.View.performClick(View.java:7448) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.View.performClickInternal(View.java:7425) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.View.onKeyUp(View.java:15060) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.KeyEvent.dispatch(KeyEvent.java:2892) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.View.dispatchKeyEvent(View.java:14247) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1954) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1959) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1959) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1959) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1959) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1959) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1959) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at com.android.internal.policy.DecorView.superDispatchKeyEvent(DecorView.java:476) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at com.android.internal.policy.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1861) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.app.Activity.dispatchKeyEvent(Activity.java:4085) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at androidx.core.app.ComponentActivity.superDispatchKeyEvent(ComponentActivity.java:126) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at androidx.core.view.KeyEventDispatcher.dispatchKeyEvent(KeyEventDispatcher.java:86) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at androidx.core.app.ComponentActivity.dispatchKeyEvent(ComponentActivity.java:144) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at androidx.appcompat.app.AppCompatActivity.dispatchKeyEvent(AppCompatActivity.java:604) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at androidx.appcompat.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:60) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at androidx.appcompat.app.AppCompatDelegateImpl$AppCompatWindowCallback.dispatchKeyEvent(AppCompatDelegateImpl.java:3413) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at com.android.internal.policy.DecorView.dispatchKeyEvent(DecorView.java:390) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:5977) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5845) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5340) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5397) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5363) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5515) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5371) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:5572) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5344) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5397) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5363) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5371) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5344) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5397) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5363) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5548) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:5706) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:3179) 04-18 17:08:40.940 6011 6011 E AndroidRuntime: at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:2721) 04-18 17:08:40.943 6011 6011 E AndroidRuntime: at android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.java:2712) 04-18 17:08:40.943 6011 6011 E AndroidRuntime: at android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.java:3156) 04-18 17:08:40.943 6011 6011 E AndroidRuntime: at android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.java:143) 04-18 17:08:40.943 6011 6011 E AndroidRuntime: at android.os.MessageQueue.nativePollOnce(Native Method) 04-18 17:08:40.943 6011 6011 E AndroidRuntime: at android.os.MessageQueue.next(MessageQueue.java:335) 04-18 17:08:40.943 6011 6011 E AndroidRuntime: at android.os.Looper.loop(Looper.java:183) 04-18 17:08:40.943 6011 6011 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:7695) 04-18 17:08:40.943 6011 6011 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method) 04-18 17:08:40.943 6011 6011 E AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) 04-18 17:08:40.943 6011 6011 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099) 04-18 17:08:40.947 2569 2813 D AudioFlinger: mixer(0xabae2080) throttle end: throttle time(45) 04-18 17:08:40.964 2774 3534 W ActivityTaskManager: Force finishing activity com.cictech.xlauncher/.MainActivity
附：Android中用两层AlertDialog来进行弹出选择框信息选择
在Android经常会用到AlertDialog，把内容使用AlertDialog结合列表的形式显示出来，然后我们点击得到点击的信息。 这里可以使用两层的AlertDialog来实现
1：我们现在xml文件中定义一个要显示内容列表数组
2：在Activity中使用 String[] items = getResources().getStringArray(R.array.item);
3：增添点击事件，使用Alertdialog.builder 千万不能忘了最后进行show()哦
直接看截图的效果:
源代码:
package com.jiangqq.alertdialog;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
/**
* 使用AlertDialog进行选择功能
*
* @author jiangqq
*
*/
public class AlertDialogActivity extends Activity {
private Button btn;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn = (Button) findViewById(R.id.btn);
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
final String[] items = getResources().getStringArray(
R.array.item);
new AlertDialog.Builder(AlertDialogActivity.this)
.setTitle("请点击选择")
.setItems(items, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
new AlertDialog.Builder(
AlertDialogActivity.this)
.setTitle("你选择了:" + items[which])
.setMessage("点击选择操作")
.setPositiveButton(
"确定",
new DialogInterface.OnClickListener() {
public void onClick(
DialogInterface dialog,
int which) {
// 这里是你点击确定之后可以进行的操作
}
})
.setNegativeButton(
"取消",
new DialogInterface.OnClickListener() {
public void onClick(
DialogInterface dialog,
int which) {
// 这里点击取消之后可以进行的操作
}
}).show();
}
}).show();
}
});
}
}
string.xml文件内容:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, AlertDialogActivity!</string>
<string name="app_name">Hello World, AlertDialogActivity</string>
<string name="btn_name">点击弹出AlertDialog</string>
<string-array name="item">
<item>第一个选择</item>
<item>第二个选择</item>
<item>第三个选择</item>
<item>第四个选择</item>
</string-array>
</resources>
