删除按钮一点击就闪退，怎么回事？
图一为用switch case方式界面没出来就闪退，所以两个按钮都不行；图二为在布局添加onClick方法在点击删除按钮时闪退，回退按钮可以用。
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你是说
R.id.user可以监听成功，而R.id.back监听不成功吗？你测试一下，能不能监听到事件，你给88行换个别的代码，例如Toast显示一个字符串，如果显示不出来，则证明，你的xml中,与你写的id不统一。如果能监听到，则证明88到93行代码的问题。你需要缩小范围排查。
LexieMIZUKI
2019-04-18 16:26:18
LexieMIZUKI
2019-04-12 19:45:56
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.ImageButton;
import com.lexieluv.imooc_note.MainActivity;
import com.lexieluv.imooc_note.R;
public class plus_fragment extends Fragment {
private ImageButton back;
private ImageButton clear;
private EditText title;
private EditText content;
// Context context;
// protected all_fragment af = new all_fragment();
// protected plus_fragment pf = new plus_fragment();
// protected user_fragment uf = new user_fragment();
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.plus_fragment,container,false);
// this.getSupportFragmentManager()
// .beginTransaction()
// .add(R.id.container_content,af)
// .add(R.id.container_content,pf)
// .hide(pf)
// .add(R.id.container_content,uf)
// .hide(uf)
// .commit();
}
@Override
public void onActivityCreated(@Nullable Bundle saveInstanceState) {
super.onActivityCreated(saveInstanceState);
initView();
}
private void initView() {
title = getView().findViewById(R.id.title);
content = getView().findViewById(R.id.content);
clear = clear.findViewById(R.id.clear);
back = back.findViewById(R.id.back);
clear.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
title.setText("");
content.setText("");
}
});
back.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
Intent backk=new Intent(getActivity(),MainActivity.class);
startActivity(backk);
// this.getSupportFragmentManager()
// .beginTransaction()
// .show(af)
// .hide(pf)
// .hide(uf)
// .commit();
}
});
}
}
LexieMIZUKI
2019-04-09 18:23:36
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.TextView;
import com.lexieluv.imooc_note.fragment.all_fragment;
import com.lexieluv.imooc_note.fragment.plus_fragment;
import com.lexieluv.imooc_note.fragment.user_fragment;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
protected ImageButton all;
protected ImageButton plus;
protected ImageButton user;
private ImageButton back;
private ImageButton clear;
private EditText title;
private EditText content;
protected all_fragment af = new all_fragment();
protected plus_fragment pf = new plus_fragment();
protected user_fragment uf = new user_fragment();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.getSupportFragmentManager()
.beginTransaction()
.add(R.id.container_content,af)
.add(R.id.container_content,pf)
.hide(pf)
.add(R.id.container_content,uf)
.hide(uf)
.commit();
initView();
}
private void initView() {
all = this.findViewById(R.id.all);
plus = this.findViewById(R.id.plus);
user = this.findViewById(R.id.user);
back = this.findViewById(R.id.back);
clear = this.findViewById(R.id.clear);
// title = this.findViewById(R.id.title);
// content = this.findViewById(R.id.content);
// back.setOnClickListener(this);
// clear.setOnClickListener(this);
all.setOnClickListener(this);
plus.setOnClickListener(this);
user.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.all:
this.getSupportFragmentManager()
.beginTransaction()
.show(af)
.hide(pf)
.hide(uf)
.commit();
break;
case R.id.plus:
this.getSupportFragmentManager()
.beginTransaction()
.show(pf)
.hide(af)
.hide(uf)
.commit();
break;
case R.id.user:
this.getSupportFragmentManager()
.beginTransaction()
.show(uf)
.hide(pf)
.hide(af)
.commit();
break;
// case R.id.back:
// this.getSupportFragmentManager()
// .beginTransaction()
// .show(af)
// .hide(pf)
// .hide(uf)
// .commit();
// break;
// case R.id.clear:
// title.setText("");
// content.setText("");
// break;
}
}
public void backClick(View view){
this.getSupportFragmentManager()
.beginTransaction()
.show(af)
.hide(pf)
.hide(uf)
.commit();
}
public void clearClick(View view){
title = findViewById(R.id.title);
content = findViewById(R.id.content);
title.setText("");
content.setText("");
}
}
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