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我的要求是单击图像,我应该通过 alertbuilder 发出警报。它发生得非常好。在警报构建器中,我指的是一个布局。然后我指的是小部件的 id。然后在 onclick 方法的这个范围内,我正在为这些小部件执行操作。

holder.source.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                Toast.makeText(getApplicationContext(), "Source",Toast.LENGTH_LONG).show();
                dialog = new Dialog(RecordingActivity2.this);
                dialog.setTitle("Source File");
                dialog.setContentView(R.layout.activity_read);
                ImageButton im = (ImageButton)findViewById(R.id.close);
                im.setOnClickListener(new View.OnClickListener() {

                    @Override
                    public void onClick(View v) {
                    **If i am making actions here application is closing unexpectedly.**

                    }
                });
                dialog.show();
                }
            });

这是我的 logcat 输出

07-04 17:25:29.923: E/AndroidRuntime(1928): FATAL EXCEPTION: main
07-04 17:25:29.923: E/AndroidRuntime(1928): java.lang.NullPointerException
07-04 17:25:29.923: E/AndroidRuntime(1928):     at com.pdev.activities.RecordingActivity2$VehicleAdapter$1.onClick(RecordingActivity2.java:209)
07-04 17:25:29.923: E/AndroidRuntime(1928):     at android.view.View.performClick(View.java:3480)
07-04 17:25:29.923: E/AndroidRuntime(1928):     at android.view.View$PerformClick.run(View.java:13983)
07-04 17:25:29.923: E/AndroidRuntime(1928):     at android.os.Handler.handleCallback(Handler.java:605)
07-04 17:25:29.923: E/AndroidRuntime(1928):     at android.os.Handler.dispatchMessage(Handler.java:92)
07-04 17:25:29.923: E/AndroidRuntime(1928):     at android.os.Looper.loop(Looper.java:137)
07-04 17:25:29.923: E/AndroidRuntime(1928):     at android.app.ActivityThread.main(ActivityThread.java:4340)
4

1 回答 1

5

代替

ImageButton im = (ImageButton)findViewById(R.id.close);

ImageButton im = (ImageButton)dialog.findViewById(R.id.close);
于 2013-07-04T12:22:58.620 回答